Hello,
I'm very new to all this so please don't be surprised if I've done something wrong.
After building a save game file in Save Builder and importing that into my memory card with mymc, the game simply says that it cannot find any Sims 2 Castaway data on the memory card, when it is very clearly there.
Now I'm not sure of the information you would require to help me with this problem but here is the PCSX2 console: (Note that the emulator loads the memory card 'castaway test, but I actually ended up importing the save into slot 2.)
I'm very new to all this so please don't be surprised if I've done something wrong.

After building a save game file in Save Builder and importing that into my memory card with mymc, the game simply says that it cannot find any Sims 2 Castaway data on the memory card, when it is very clearly there.
Now I'm not sure of the information you would require to help me with this problem but here is the PCSX2 console: (Note that the emulator loads the memory card 'castaway test, but I actually ended up importing the save into slot 2.)
Code:
PCSX2 1.5.0-20170524134452 - compiled on May 24 2017
Savestate version: 0x9a0d0000
Host Machine Init:
Operating System = Microsoft Windows 10 Pro (build 15063), 64-bit
Physical RAM = 16269 MB
CPU name = Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
Vendor/Model = GenuineIntel (stepping 09)
CPU speed = 3.398 ghz (8 logical threads)
x86PType = Standard OEM
x86Flags = bfebfbff 7fbae3ff
x86EFlags = 28100000
x86 Features Detected:
SSE2.. SSE3.. SSSE3.. SSE4.1.. SSE4.2.. AVX
Reserving memory for recompilers...
Loading plugins from C:\Users\mypantsfelldown\Documents\pcsx2-v1.5.0-dev-2104-g49840bb-windows-x86\plugins...
Bound GS: GSdx32-SSE2.dll [GSdx 20170524134452 (MSVC 19.00 SSE2/AVX) 1.1.0]
Bound PAD: LilyPad.dll [LilyPad (20170524134452) 0.12.1]
Bound SPU2: Spu2-X.dll [SPU2-X 20170524134452 2.0.0]
Bound CDVD: cdvdGigaherz.dll [cdvdGigaherz 20170524134452 0.11.0]
Bound USB: USBnull.dll [USBnull Driver 20170524134452 0.7.0]
Bound FW: FWnull.dll [FWnull Driver 20170524134452 0.7.0]
Bound DEV9: DEV9null.dll [DEV9null Driver 20170524134452 0.5.0]
Plugins loaded successfully.
(GameDB) 9709 games on record (loaded in 128ms)
HLE Notice: ELF does not have a path.
Initializing plugins...
Init GS
Init PAD
Init SPU2
Init CDVD
Init USB
Init FW
Init DEV9
Plugins initialized successfully.
Patches: No CRC found, using 00000000 instead.
Opening plugins...
Opening GS
Opening PAD
Opening SPU2
Current Renderer: Direct3D 11 (Hardware renderer)
Opening CDVD
isoFile open ok: E:\CASTAWAY.ISO
Image type = DVD
* CDVD Disk Open: DVD, Single layer or unknown:
* * Track 1: Data (Mode 1) (2259488 sectors)
Opening USB
Opening FW
Opening DEV9
McdSlot 0 [File]: C:\Users\mypantsfelldown\Documents\pcsx2-v1.5.0-dev-2104-g49840bb-windows-x86\memcards\CastawayTest.ps2
GSdx Lookup CRC:0
McdSlot 1 [File]: C:\Users\mypantsfelldown\Documents\pcsx2-v1.5.0-dev-2104-g49840bb-windows-x86\memcards\Mcd002.ps2
Plugins opened successfully.
EE/iR5900-32 Recompiler Reset
Bios Found: Europe v02.00(14/06/2004) Console
# Initialize memory (rev:3.70, ctm:196Mhz, cpuclk:147Mhz detected)
Frame buffer size set to 512x512 (2048x2048)
PlayStation 2 ======== Hard reset boot
ROMGEN=2004-0614, IOP info (CPUID=1f, CACH_CONFIG=0, 2MB, IOP mode)
<20040614-100914,ROMconf,PS20200EC20040614.bin:11696>
# Total accessable memory size: 32 MB (B:2:8:0) (370:2:7c30)
# TLB spad=0 kernel=1:12 default=13:30 extended=31:38
# Initialize Start.
# Initialize GS ...
# Initialize INTC ...
# Initialize TIMER ...
# Initialize DMAC ...
# Initialize VU1 ...
# Initialize VIF1 ...
# Initialize GIF ...
# Initialize VU0 ...
# Initialize VIF0 ...
# Initialize IPU ...
# Initialize FPU ...
# Initialize User Memory ...
# Initialize Scratch Pad ...
# Initialize Done.
EE DECI2 Manager version 0.06 Feb 6 2003 08:38:48
CPUID=2e20, BoardID=0, ROMGEN=2004-0614, 32M
Patches: No CRC found, using 00000000 instead.
(SYSTEM.CNF) Detected PS2 Disc = cdrom0:\SLES_549.03;1
(SYSTEM.CNF) Software version = 1.01
(SYSTEM.CNF) Disc region type = PAL
ELF (cdrom0:\SLES_549.03;1) Game CRC = 0xE7692E0B, EntryPoint = 0x00100008
(SYSTEM.CNF) Detected PS2 Disc = cdrom0:\SLES_549.03;1
(SYSTEM.CNF) Software version = 1.01
(SYSTEM.CNF) Disc region type = PAL
IOP Realtime Kernel Ver.0.9.1
Copyright 1999 (C) Sony Computer Entertainment Inc.
Reboot service module.(99/11/10)
cdvd driver module version 0.1.1 (C)SCEI
Load File service.(99/11/05)
Multi Threaded Fileio module.(99/11/15)
iop heap service (99/11/03)
loadelf: fname cdrom0:¥SLES_549.03;1 secname all
loadelf version 3.30
Input ELF format filename = cdrom0:¥SLES_549.03;1
0 00100000 0040c1c8 .................................................................
1 70003ff0 00000010 .
Loaded, cdrom0:¥SLES_549.03;1
start address 0x100008
gp address 00000000
# Restart Without Memory Clear.
# Initialize GS ...
# Initialize INTC ...
# Initialize TIMER ...
# Initialize DMAC ...
# Initialize VU1 ...
# Initialize VIF1 ...
# Initialize GIF ...
# Initialize VU0 ...
# Initialize VIF0 ...
# Initialize IPU ...
# Initialize FPU ...
# Initialize Scratch Pad ...
# Restart Without Memory Clear Done.
Elf entry point @ 0x00100008 about to get recompiled. Load patches first.
Memory available from OS is 26888 KB
Initializing DMAHeap:
start = 0x005BB280
size = 003276800
Initializing ResourceHeap:
start = 0x008DB280
size = 006819840
Initializing ModelHeap:
start = 0x00F5C280
size = 000819200
Initializing TextureHeap:
start = 0x01024280
size = 003686400
Initializing ShaderHeap:
start = 0x013A8280
size = 000163840
Initializing AnimationHeap:
start = 0x013D0280
size = 001638400
Initializing FlashesHeap:
start = 0x01560280
size = 000573440
Initializing AptHeap:
start = 0x015EC280
size = 000225280
Initializing AudioHeap:
start = 0x01623280
size = 000159744
Initializing MainHeap:
start = 0x0164A280
size = 010170752
Constructing application.
Datatype sizes:
sizeof(char) = 1
sizeof(short) = 2
sizeof(long) = 8
sizeof(long long) = 16
sizeof(int) = 4
sizeof(float) = 4
sizeof(double) = 4
sce_iopmem: unrecognized code 7
IOP Starting memory free: 0
detected media: DVD
set media mode: 2
IOP module replacement:"cdrom0:¥IOPRP300.IMG;1"
IOP rebooted - ProDG Tuner will not work
Get Reboot Request From EE
GSdx Lookup CRC:E7692E0B
PlayStation 2 ======== Update rebooting..
PlayStation 2 ======== Update reboot complete
cdvdman Init
IOP Realtime Kernel Ver. 2.2
Copyright 1999-2002 (C) Sony Computer Entertainment Inc.
Initializing SIF...
Reboot service module.(99/11/10)
cdvd driver module version 0.1.1 (C)SCEI
Load File service.(99/11/05)
Multi Threaded Fileio module.(99/11/15)
iop heap service (99/11/03)
detected media: DVD
set media mode: 2
(UpdateVSyncRate) Mode Changed to PAL.
(UpdateVSyncRate) FPS Limit Changed : 50.00 fps
Frame buffer size set to 640x512 (2560x2048)
Loading IOP module cache...
Module="libsd", size=30144
Module="mcman", size=96192
Module="mcserv", size=7424
Module="padman", size=45952
Module="sio2man", size=6656
Module="stream", size=138496
Loading IRX modules...
Exit MultiStream V6.2 Thread Load
detected media: DVD
Binding with stream.irx version 7
Trying to bind regular callback
Waiting for INTERNALrpc.serv != 0
Trying to bind load complete callback
Waiting for LOADCOMPLETErpc.serv != 0
Done Binding
VU1 Region 0: begin= 0 end= 274
VU1 Region 1: begin= 274 end= 419
VU1 Region 2: begin= 419 end= 454
VU1 Region 3: begin= 700 end= 1654
VU1 MPG 0: begin= 0 end= 274 len= 274 region=0
VU1 MPG 1: begin= 274 end= 419 len= 145 region=1
VU1 MPG 2: begin= 419 end= 454 len= 35 region=2
VU1 MPG 3: begin= 700 end= 1337 len= 637 region=3
VU1 MPG 4: begin= 700 end= 948 len= 248 region=3
VU1 MPG 5: begin= 700 end= 998 len= 298 region=3
VU1 MPG 6: begin= 700 end= 1654 len= 954 region=3
************************************************************************
SOUND_DisplayStats
========================================================================
VERSION: MultiStream V7.0
SPU buffer mode currently in V6.2 mode.
SOUND_ResizeSPUBuffer ACTIVE.
SPU RAM buffers can be different sizes to their stream IOP buffers.
NOT SCREAM COMPATIBLE (modify ms_switches.h and recompile IOP to enable)
INFO: SPOT FX
Memory Allocated at IOP Address: 0x4c500
Allocated space for 50 SFX
INFO: FILE
Memory Allocated at IOP Address: 0x4bf00
Allocated space for 30 SFX
INFO: STREAM
Stream Channel 0 allocated: IOP Addr=0x69c00 IOP Size=0x10000, SPU Addr=0x0, SPU Size =0x10000
Stream Channel 1 allocated: IOP Addr=0x79c00 IOP Size=0x10000, SPU Addr=0x0, SPU Size =0x10000
Stream Channel 2 allocated: IOP Addr=0xabc00 IOP Size=0x10000, SPU Addr=0x5010, SPU Size =0x10000
Stream Channel 4 allocated: IOP Addr=0x4ea00 IOP Size=0x8000, SPU Addr=0x0, SPU Size =0x8000
************************************************************************
Closing plugins...
Closing DEV9
Closing FW
Closing USB
Closing CDVD
Closing SPU2
* SPU2-X: Waiting for DSound thread to finish... Done.
Closing PAD
Closing GS
Plugins closed successfully.