purple square in front of light sources in silent hill shattered memories

[DrHycodan]

I am using r5065 with gsdx11 software and the rest on default. Tried different clamping modes and doesn't help. Please look into this, I have also attached a .gs file.
   

[Squall Leonhart]

that looks amusingly like the burnout purple window glitch....

[Gabest]

Oops, this bug has been there in the google repository since the first revision. The not block aligned filled rectangles were not color-masked correctly. There are more unaligned rectangle edges now because the multi-threaded renderer splits up the screen to smaller pieces. Nice find.