I downloaded and installed qtparted with yum. Qtparted worked once. When I tried to open it again, I received a "floating point exception" error message. Uninstalling and reinstalling did no good.
All Google yielded was the complaints of persons with the same problem.
What is the correct diagnosis of this problem?
Reboot [sic.] after commiting changes. There is seems to be an issue with the kernel not reloading partition tables on busy drives, or at least so says qtparted's site.
If it does not help, run qtparted from a terminal and watch the output, it might be quite indicative of the problem. If you still can't see the issue, try running qtparted through strace and ltrace.
Good luck,
Andro