I'm a bit dim. I'm trying to install Flash on OS X, and I keep getting this popup message, which is unresponsive:
I click on "Allow", but nothing happens.
Are the clicks on "Allow" being ignored? If so, you might be running into an iMac / ATI bug. Please take a look at this FAQ to see if it helps you work around the problem.
Working around the 10.7 Lion Flash Player settings bug
Thanks for pointing me in the right direction. I can see that going through System Preferences should work.