[ubuntu] Broken Radeon 3450 drivers?

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http://ubuntuforums.org – Earlier tonight I had Compiz etc running happily on a ATI Radeon 3450 card. Then I tried to get things working with a second monitor which I sometimes use. Didn't like the result (esp as it killed Compiz) so went back. Now I can't get the "Extra" visual effects enabled again. Further, a glance at Xorg.log.0 says that the driver is reporting the card as an "unknown 3rd party" card, whereas an earlier log shows it detected quite alright. I've tried reinstalling all the ATI related packages I can find, and I've deactivated and reactivated the ATI Fire GL driver. (Hardware)