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So the first thing I notice upon installing KDE is that my cursor is very ugly. I go in the settings. There's a nice pane with lots of different cursor sets to choose from. This is great! I double click on one. Nothing happens. I notice an "Apply" button. It's grayed out. I select a different cursor set. "Apply" re-enables. I click "Apply". Nothing happens. At no point in this interaction do the cursors change at all. Bad sign.