Chat-Window Problem - White BG??

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Hi everyone.
I have installed the latest "Drums UI Mainchat (LU40)" and experience the same problem I had before with older versions.
Now i finally found some time to ask here for a little fix for this.

The tabs of the chat window should usually be blue or something, but I only have white tabs. See attached image

Hope som1 can help me with this.
Greetz, Chris.