[Typo3] User Settings lost ?

[Jean-Baptiste Rio]

Some questions I have in mind to help you understand :
- Where are this settings recorded in Typo3 ? In the database or in a BE 
cookie or ...?
- Are the settings changed or it is just a problem of a correct reading 
of them ?
- Have you check the database ? Size of the tables ? I have in mind a 
sort of "timeout" for the settings request...
- Did you check that he didn't create many BE users and he uses them 
without realize that BE users have their own settings...
- TS script maybe somewhere ?

Just My2P