problem with blurring

hi im new and hope someone can help me.

i have 2 renderlayers. in the 2nd layer i’ve seperatet the objects with object id to blur them later seperately for a Animation. i blurred them all for a test Rendering and get a squared border.

im using fast gaussian. what i am doing wrong?

Can you upload a blend file or at least a screenshot of your node setup?

here the .blend file


blurr.blend (1.22 MB)

i tested the same blend file with blender 2.66 and blender 2.69 . both rendered and composited correctly without Problems.

only with blender 2.70 a this issue happens.

With smaller chunksize (32 and 64 square) the border disappears.

Report a bug.