If you are using the latest stable versions of either Eclipse or Zend Studio on Ubuntu with KDE installed you might have run into some trouble along the way. If you have oxygen theme installed the IDE will crash whenever you want to create a new project. Or maybe the close buttons won’t work. Plenty of problems.

However there is a simple solution which I found digging around the comments in bug reports.

For oxygen, edit the normally already existing file “/usr/share/themes/oxygen-gtk/gtk-2.0/gtkrc” and change
GtkComboBox::appears-as-list = 1
into
GtkComboBox::appears-as-list = 0

Works like a charm!

All credit goes to Axel Müller for pointing to the original comment made by Hugo Pereira Da Costa.

P.S.: The workaround for this is quite old. However since google search does not provide the straight up answer and the problem persists in latest Ubuntu 14.04 LTS I have decided this is worth a post.