I am using Firefox 4 on Windows 7, Flash is installed correctly and it works.
Sometimes, the graph of recent users is displayed, sometimes it is not, and then, Piwik complains about Flash 10 missing. All other graphs are displayed correctly, though.
It is also not a Firefox extension problem, since it works sometimes without any changes in the Firefox installation.
sometimes this happens with opera too …
workaround: remove the widget and add it again
I also experienced the same problem
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