Fbo, image Noise problem

Hi. I have some error some output

I used ofFbo and ofTexture
ofTexture is graphic image(Png Sequence) and ofFbo is mask(back) image
when start code and after 3second then appear the line noise on top side and the object position was pushed donw…
i don’t know why appear this noise.
please help me please

this link show my issue thank u
http://blog.naver.com/dnflrkwhr888/221139399391

Hi. It’s hard to say without seeing any code… Can you post a very small example that shows this issue?