Heratech

I have just moved to Archlinux - mainly due to its rolling release policy and because (for me) the last 2 Ubuntu releases have been awful.
To be fair I had the same Xinerama + Qt + Xorg 1.9 = Crash problem on Archlinux as well but anyway...

Another issue I had was after installing flashplugin-prerelease using:

yaourt -S flashplugin-prerelease

I got this warning:

warning: directory permissions differ on usr/lib/mozilla/
filesystem: 700 package: 755

And firefox did not detect the plugin (about:plugins was empty)

Downloaded the Flash 10 plugin here: http://labs.adobe.com/downloads/flashplayer10.html

The install instructions were listed as:

1. Download the plugin to begin installation. A dialog box will appear asking you where to save the file.
2. Save the .tar.gz file to your desktop and wait for the file to download completely.
3. Quit your browser.
4. Remove all existing Adobe Flash Player installations from the system.
5. Unpackage the file. A directory with contains libflashplayer.so will be created.