Thanks for your bugreport. we fixed a number of problems in the software-properties dialog recently. Please test the latest upload (0.54) and check if that still has issues.
Cheers, Michael ** Changed in: software-properties (Ubuntu) Status: Confirmed => Fix Committed -- Software Sources Window Closes Upon Opening https://launchpad.net/bugs/71983 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs