H.264 seek artifacts (pause mode) in long video but not short one

Hello, 

I am using VLC 1.1.12 "The Luggage" on Ubuntu 11.04 Natty on x86 
(32-bit).  

I have a file which is H.264 video and AAC audio in an MKV 
container.  When I pause VLC, then drag (seek) the track slider 
back and forth, there are blocky artifacts in the video, and 
sometimes the video goes to inverse-video (areas that are supposed 
to be almost black turn light-gray, etc.).  These artifacts do not 
happen when I drag the track slider in play mode instead of in 
pause mode.  

The video was made by using Avidemux 2.5.6 to concatenate some FLV 
files.  I set Avidemux to "copy" mode (rather than transcoding) for 
both the video and audio streams, and I used Avidemux's "Video > 
Frame Rate" menu option to adjust the frame rate.  

The seek artifacts in VLC don't happen with the input FLV files, 
neither in pause mode nor in play mode.  

Does this sound like any known issue in VLC?  

I will be glad to upload one of the input FLV's, as well as the 
output MKV, to the VLC FTP samples server, but I would like someone 
to confirm first that this is the recommended way to troubleshoot 
(maybe there is some other obvious solution).  

Also please ask me for any other info that may help in 
troubleshooting the seek artifacts.  

Thanks in advance for help.  

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