Firefox 17.1 hangs up on every use of the flash player

I have activated 'click to play' for plugins at the moment (by about:config). Whenever i click on a flash area in a website, my browser hangs up.

My browser is Firefox 17.0.1 (don't know, if the problem existed even with version 17.0). Firefox 16.0.2 is working properly with the same Flash plugin (current release by 26th, December, 2012).

My browser version is the official version, which is downloadable from the Firefox website at any time (and not the repository version from Ubuntu 12.04) and the flash plugin is saved in the 'plugins' subdirectory, as usual. (Firefox also hangs up with deactivated add-ons in safe mode, as plugins aren't deactivated in this mode)

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