Indicator font&color changed in Unity

I'm using a dual desktop enviorment Kubuntu with an additional Unity. I need it this way since it's a multiuser system and either side would complain.
I'm installing the System by using a Kubuntu 14.04 as base and install ubuntu-desktop later on. If I switch into Unity the Indicators changed, by now having black as font-color and the font is somewhat smaller.
This only occurs if the user ever used KDE even once. If I create a new user, and logon into Unity the fonts and color are normal. If I switch to KDE and back to Unity later on, the font-color is black again. Therefor I thing this comes from KDE messing around with some Configfiles Unity is using.
I would appreciate if someone could help me by at least point out which files I should look at.

kind regards
Moritz