Everytime I right-click on the edge of a window, hold down the LMB and move it somewhere or the Cursor is over a menu bar, the Screen looks like that:
http://www.directupload.net/file/d/945/VldnpJ9f_jpg.htm
afterwards it is normal again
I already reinstalled blender (2.42, Windows)
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That really means you have a 3d card with limited OpenGL support. It could be the drivers installation has to be upgraded... but definitely not a Blender bug!
Angemeldet: JA
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It may be that the Anti-Aliasing was the reason. after I upgraded my drivers (without succes), I deactivated all grafical features and now it seems to work. (Info: I have a X1900XT, so I don't think limited OpenGL is the reason ;) )
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Ah, the full-scene AA. That is indeed a game feature, not useful for 3D tols that draw the UI in opengl.
This is a generic request to test your bug report and see if it is still an issue in 2.5alpha2 if so please let me know by making a comment in this report ie 'also in 2.5alpha2' and I will add it to the 2.5 bug list.