[ubuntu] External drives no longer mount

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http://ubuntuforums.org – Hi, I'm running 9.10, and external usb drives are no longer being detected and mounted automatically. I can see the devices if I run Palimpsest disk utility, but the option to mount them is not available. I have been working on getting a scanner to work today, and made a small modification to /lib/udev/rules.d/50-udev-default.rules in order to sort out some permissions problems as advised in the thread at http://ubuntuforums.org/showpost.php...52&postcount=8 I have tried to see whether reversing this change would help, but after the advised reboot, the file appears to have reverted to its original version - I've used diff to compare the current version with the backup and it returns no results, so I'm pretty baffled. Finally, I tried reinstalling udev via Synaptic but no change. Anyone got any ideas? Thanks (Hardware)