OS X Lion v10.7 Time machine won't do incremental backups.

Time machine under Snow Leopard used to do small incremental backups just fine. After upgrading to Lion though, every time I try to do a time machine backup, it attempts to perform a full backup (hundreds of gigabytes every time). Usually the first full backup completes fine but instead of doing subsequent small/incremental backups of the changed files, it starts over doing full backup but there isn't enough room on the backup drive for that so it fails.
I've found other people with the same issue here: http://forums.whirlpool.net.au/archive/1745345
And attempted several suggested fixes/tests but none of them work just as in that thread. Am I alone in this issue? Any suggestions?
I have a 10.7.1 install on a mid 2010 15" MBP with two drives (one SSD, one HDD, no optical). As I mentioned before, time machine worked beautifullly under 10.6.x backing up to external 1TB FW 800 -> SATA bridges.
Thanks,
M

I have the same problem only full backups all the time I upgraded from Snow Leopard to Lion and on Snow Leopard I had no issues with Time Machine. So what I have done:
Formated the Time Machine Backup Disk (it's an USB-drive) - didn't help
I deleted all the Time Machine Settings (plists) - didn't help
Used Disk Utility to verify user rights and drive - didn't help
Used TechTool Pro 6 to verify the drive - didn't help
I still only get full backups. If I exclude the a catalogue/folder, the backup will be smaller, but it still takes a full backup of the items selected ...
My system is the same as before the upgrade - no new hardware and so on. This is really strange

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