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Me thinks it is a problem with the X config. I don't know of any bug in KDE in which this happens, and it sounds like that it is a refresh problem. Have you configured your monitor properly? Have you also configured you graphics? I would use xconfigurator in RedHat to make sure.
I can't think of what the problem would stem from in KDE - especially the latest version. It has worked well enough for me, but I suppose you could log the issue with the kde team, and they may be able to help you.