Flash Player debugger dead - reinstall...

Without any obvious cause, I suddenly cannot debug anything from Flex.

My development computer is a quad G5 PowerPC Mac running OS X.5.8

When I try to debug I get this message in a popup:

/Library/Internet Plug-Ins/Flash Player.plugin

Flex Builder cannot locate the required debugger version of Flash Player. You might need to install the debugger version of Flash Player 9 or reinstall Flex Builder.

Do you want to try to debug with the current version?

Flash Player debugger dead - reinstall...

I found a suggestion in another debugger problem thread to run a Flash Player installer from within the Flex Builder folder. I found an app named ''Flash Player 9 Silent Installer.app'' and ran it.?My debugging functionality is back now, but the player version is a lot older.

The only culprit I can think of for this problem is Firefox. I recently upgraded to v 3.5.3 and I remember it popping up a warning about Flash Player needing to be upgraded immediately. I wonder if it overwrote something that caused this?