I am asking this here, because I NEVER had this (or any other issues) before "upgrading" to 12.04.
When I open a photo in gimp, I can select, under the Colors menu, any of the options and they all work fine... EXCEPT for Levels. When I click Levels, it hesitates a couple of seconds and then the Level dialog box pops up. I cannot select any of the options, sliders or buttons - including OK or Cancel - nor can I close the dialog box. I can drag the box around the screen, but the gimp windows underneath the dialog box are never redrawn.
The only way I can get out of the dialog box is to kill the gimp process. I have tried to apt-get --reinstall gimp but that had no effect on this issue.
Any ideas? Please?