The solution is twofold. One, you must use the mercurial version. Two, you must make this manual edit.
Line 3041 of core/libengine.py should read like this:
surf = pygame.transform.scale(surf,(int(size),int(size)))
Seems fine to me after those changes.
Game: Commander Stalin
One idea made me laugh:D
The plane just stuck on air. WOW.
fixed. comments were disabled for no particular reason.
Thanks for the info, I'll add it in next few days (if nobody else will do it).