Some files don't clear properly during animation

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Load an offending file

What is the expected output? What do you see instead?
The file should animate like normal. Instead it animates, but never clears the 
screen after each frame, making each frame stack on the previous one.

What version of the product are you using? On what operating system?
0.6

Please provide any additional information below.

Original issue reported on code.google.com by henke@henke37.cjb.net on 20 Sep 2010 at 9:29

Attachments:

• 1-lock-breaks.gif