win7 64 / quadro 4000
Broken: (example: 2.72b 64 bit official)
Worked: (same crash in 2.67)
Short description of error
Created a curatin aranged in a circle. when trying to unwrap, -blender crashes.
Exact steps for others to reproduce the error
Load blend testfile (see pasteall link).
Enter editmode. select all. hit u for unwrap.
Maybe a hint:
deleting one loop, will prevent from crashing.
See this file: