Flash doesn't work sometimes

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http://forums.fedoraforum.org – Hello, I'm new to Linux (though I have tried it a couple of times, so I've some understanding) and I just installed Fedora 12 on my computer. Installation went perfect, even tweaked it a little bit and everything works; except for Flash Player. I installed it by following some guide and I can watch YouTube vids and all, but sometimes the YouTube video player doesn't respond to my mouse. I can click on play/pause but it gives no response whatsoever; I can click on the sound but it gives no response whatsoever. Sometimes it all works perfectly, but when I click on the next vid it suddenly doesn't respond anymore. Can you help me fix this? Thanks in advance, FallenUnia (HowTos)