Why can't adobe reader (free) download and open a.pdf file using firefox on my macbook pro, running mountain lion. Why can't adobe reader (free) download and open a.pdf file using firefox on my macbook pro, running mountain lion.

Seemingly out of the blue, Acrobat (Reader) was crashing at launch ('Application has unexpectedly quit'). I trashed the prefs for Acrobat, and the problem persisted.

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I checked for a crash log in ~/Library -> Logs -> CrashReporter and read the AcrobatReader 5.0.crash.log (if you double-click on the file, it should just open up in the Console utility). Two lines caught my eye: #1 0x001e4640 in LanguageSelector::ChooseSystemLanguage(void) #2 0x001e3d5c in LanguageSelector::OpenDefaultLanguageResFile(void)And that seemed pretty strange to me (!): Acrobat was trying to check my language setting(s) and found nothing? So, I opened my System Preferences -> International Prefs, and clicked on the Language tab. In order to force a value to be written (not sure where that pref lives.), I dragged French to the top of the list and closed the Pref panel (Show All). I opened it again and moved English back to the top of the list and quit out of System Preferences (be sure not to skip this step!). And voila - the problem was fixed, Acrobat Reader launched fine.