www.iforce2d.net

Thanks for reply!

Unfortunatelly I have not run the app on other versions of ubuntu than 13.04 32-bit. Current ubuntu on my laptop is clean install. As a suggestion: try to install all currently available updates and reboot.
Now I'm using windows version through wine, it works well.

Same issue on Ubuntu 13.04. Aborting polygon fixture creation due to coincident vertices in fixture: ... when trying to open scene. Also sometimes app crashes on scene opening with following message: rube.bin: /home/chris/projects/rube-autobuild/rube-src/1.3.1/lin32/rube/box2d/Box2D/Box2D/Collision/...