The same thing is happening to me. I have trashed Flash preferences repeatedly (actually, ~/Library/Preferences/Macromedia/Flash Player) and that used to work. Yesterday, I used System Preferences>Flash Player>Storage, clicked Delete All and then Delete All Site Data and Settings. I reset my preferences and, so far, they seem to be sticking. Apparently, Delete All also clears ~/Library/Caches/Adobe/Flash Player so that may have been the cure.
I just trashed ~/Library/Prefs/Macromedia and ~/Caches/Adobe in their entirety, but I'm not the least bit optimistic about the reversions to default stopping.
We'll see...
The new Great Equalizer is the SEND button.
In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire
