Well, did anyone have a look at src/plugins/codecompletion/resources/classbrowser.xrc???
when i test this with XRCed it looks ok, all bg and fg colours are set to default, also the
CodeBlocks\share\CodeBlocks\code_completion.zip
contains the right classbrowser.xrc file,
i don't know why this happens, but it is not related to an outdated classbrowser.xrc file.