Firefox won't start as soon as the User Home is on XSan

Hi,
We are migrating our User Home Directories to XSan.
As soon as we copy the User Home Directory from the old Servervolume to XSan, Firefox 2.0 won't start, showing an alert, that it's already running.
Deleting the Firefox preferences in ~/Library/Preferences and ~/Library/Application Support doesn't help either. Firefox then asks me to create a new profile. When this is done and a want to start with the new profile, FF tells me, that the Profile is already used.
Same thing with Camino and Firefox 1.5
Is anyone else having this issue?
Greetings from Bavaria,
ubwm

@Robert:
Be assured we thought about all that. (And Apple Germany and some consultants did as well.)
We are now rolling out using a XSan environment and user homes without mobile accounts. Mobile accounts is no solution if you need to have 300 users using 200 machines and switching machines like crazy We would have all the machines cluttered by synced Home folders in no time. We know of the drawbacks but it's the only solution that fits our needs.
Our users are discouraged from keeping large amounts of own data on their Home, which is mostly for the Library and some personal files. We keep all our production data on specialized (and non-Apple) file servers, so searching is not as tremendous an issue. (We disabled spotlight and use EasyFind).
Regards from Bavaria,
ubwm

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