ffmpeg, removelogo filter, common assert failure

Hi,

I'm using;

ffmpeg=8:1.0.6-dmo2 libavcodec54=8:1.0.6-dmo2 libavdevice54=8:1.0.6-dmo2
libavfilter3=8:1.0.6-dmo2 libavformat54=8:1.0.6-dmo2
libavutil51=8:1.0.6-dmo2 libpostproc52=8:1.0.6-dmo2
libswresample0=8:1.0.6-dmo2 libswscale2=8:1.0.6-dmo2

I'm trying to use the filter 'removelogo' and I'm getting

[h264 @ 0x88fda00] Using externally provided dimensions
[Parsed_removelogo_0 @ 0x819d900] frame copy needed (have perms 5, need
3, reject 0)
Assertion ref->buf->refcount > 0 failed at libavfilter/buffer.c:161
Aborted

I see the same behaviour using a win32 build ffmpeg version
N-45279-g1a104bf.

Is this a bug more generally related to filtering or is it likely
specific to removelogo and, if the latter, are there any testcase files
and commandline that I could try?

Thanks,

Scott.