Can't change Ubuntu as default at login

[timbo3]

I recently installed Gnome 3 and KDE on my laptop with Ubuntu 12.10. Problem is that when I log out to change the desktop environment I cannot change from Ubuntu to anything else. I see them in a list and I can click on them but nothing happens. Ubuntu is there as default and I cannot change it.

I tried to search for a solution here but I gave up after looking for answer. I hope you guys can help me.

[Frogs Hair]

I remember an old bug from 12.10 were I had to use the tab or arrow keys to select different DE's , but that was a beta version as I remember and it was fixed at least for me.

[timbo3]

[SOLVED]
Yes. It was as simple as that. I couldn't see the OK button because it was "below" my screen. A simple tab stroke + Enter made all the difference! Thanks a lot :)