Oneiric 32bit - Firefox problem: flash stop working

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http://askubuntu.com – I got a weird issue this morning: after an update, my firefox flash plugin stopped working. For any flash object I try to run, it appears a weird black page with a slider on the bottom (like a video player) but nothing happens. Obviously, any of the flash videos (or even games) tried were working perfectly under Google Chrome. I tried to remove and reinstall adobe-flashplugin from USC, but nothing changed. I had Oneiric 32bit with some testing repo like ricotz-testing ppa (even if I don't know if this matters). (HowTos)