Hello! I have two computers with KDE 4.2 installed
HP laptop (amd64, nvidia geforse 7200) and older computer(geforse4 mx) Both running debian.
Somthing strange is going on with panel:
On laptop one user has panel was black and translucent(by default). second user has blue panel ( by default). desktop effects enabled, tried to disable it, tried to change themes, all the same - one user black, other blue.
On old computer I have three panels: bottom panel is blue, left panel(hidden) is black, and top panel(hiden) is black!?! It was until yesterday, I switched to elegance theme, and back to oxygen,and now all panels are blue!?! What happend? All desktop effects turned off (I tried to turn on xrender instead of opengl,and now I can't turn them on with opengl, only xrender, maybe another bug?)
So, my question is:
How do I make my panels blue or black or transparent?
I've found black panel in /widgets directory (in oxygen theme folder) and blue one in /opaque/widgets, So how do I make it "opaque"

The black and blue panels are from the default Oxygen theme - black (transparent) if Desktop Effects are enabled, otherwise blue (opaque). Of course, your panels should have the same color. The issue you have sounds like a bug to me. I think I saw someone else describing the same problem, so you might find that a bug report has already been submitted if you do a search on http://bugs.kde.org.

As a workaround (if you can enable desktop effects again), you can try the following:
- After enabling desktop effects, change plasma theme to something else, and then change back to Oxygen.
- Restart KDE after enabling desktop effects.

If you can't find a bug report and decide to submit one, please add a link to it here.