Created attachment 72155 [details]
Image that shows wrong UI look.
With KDE 4.10 RC1 (4.9.95) on Kubuntu 12.10 (Linux md 3.5.0-21-generic #32-Ubuntu SMP Tue Dec 11 18:51:59 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux) both LibreOffice 3.6.4 and 4.0.0 Beta 2 have problems with UI elements.
If QtCurve is selected (or other theme for GTK applications), then UI looks more or less correctly.
Created attachment 72156 [details]
More or less correct look of UI with another theme.
Do you have these packages installed?
And what theme is selected when it does not work well?
I mean, if I run Kubuntu live cd, LibreOffice looks well without any tuning.
I'm trying a 13.04 daily builid with KDE 4.10 and looks fine too. I've played a little with KDE themes but was not able to mess anything
GTK theme is set to Oxygen-GTK
Run a live cd, set it in English, and please provide exact steps to reproduce
Installing libreoffice-kde and libreoffice-style-oxygen fixes the problem.