When running eclipse under fluxbox I get graphic errors (see attached screenshot), basically the whole window stops drawing.
When I click into the text editor a few times, drawing begins to work again.
Here's what I tried to get rid of the problem (to no avail, alas):
Upgraded Fedora from 20 to 21
Changed back and forth between nouveau and nvidia proprietary drivers
export SWT_GTK3=0 to prevent GTK3 from happening
changed graphic card
As soon as I switch to KDE the problems are gone. Therefore I think it has something to do with fluxbox. Only I don't have a clue as to what this could be...
After switching to KDE for half a day I got the error there as well. So it has nothing to do with fluxbox, this bug can be closed.