The 4.x incarnation of KDE is still pretty much in its infancy, so there are still bugs to be ironed out, especially when it comes to running them in Ubuntu‘s default desktop environment, Gnome. I’ve noticed bits and pieces of programs don’t always display properly, like when I click on an alarm task in KAlarm to edit it. Basically, the box pops up, but all I can see is the charcoal KDE4 background, and clicking around in it does nothing.
But I found if I maximise it, suddenly everything appears, then I can then restore the dialogue box to its proper size (not that I really need to), and then proceed with the task. So if you get the same thing happening with a KDE4 app in Gnome, try maximising it to see if it makes a difference.
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