Thank you very much for having a look at my code!
It seems that the display problems on the PPC were caused by refreshing the entire form at every timer tick which was obviously more than it could handle. I will continue with the method you have implemented - it looks like a good solution. It is certainly more efficient and much less flickery.
There still seems to be an issue with the display on the PPC though - transparency. It works fine on the desktop, but what should be transparent shows up black on the PPC. Something to worry about later though perhaps. Thanks again for your help.
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