User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7b) Gecko/20040316 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7b) Gecko/20040316 like i said in the summary. i'm gonna upload a screen capture avi file right now. Reproducible: Always Steps to Reproduce:

couldn't upload to bugzilla, so uploaded here: http://jocohp.hu/rgb.zip (2276 kilobytes) inside you'll find a 200 megabytes rgb uncompressed avi. sorry, but if it were compressed, you would miss the point because all standard codecs generate their own artifacts. you'll see that if i scoll the listbox in the helper applications panel down, more than where it allows, the box sometimes gets a little bigger, and everything below it moves down a bit too. please tell me if you download and checked the file because i'll soon have to remove it from the server.

Looked at your avi file: I think you'll find this only happens in helper apps. Dup of bug 143663 *** This bug has been marked as a duplicate of 143663 ***