Block noise? when trying to send dv stream to video camera

[Alexander Nedotsukov]

Hi,

I have Sony DCR-HC40 video camera and trying to use firewire link to 
download->edit->upload movie form it. I used fwcontrol -R test.dv 
command to download data. Whole process went just fine. I can play raw 
dv data and content looks correct. But if I try to send dv video (either 
unmodified) back to the camera with fwcontrol -S test.dv command picture 
get corrupted quickly. Corruption looks like whole image splitted into 
square blocks and some parts of those blocks stay gray while
another contains correct image. Blocks are moving. The size of blocks
may vary. Time before video get corrupted as well from 0 to 50 sec. Do 
you have any idea what it can be and what is much better how to fix the 
situation?
I running one week old -CURRENT world+kernel.

Thanks,
Alexander.