[TYPO3] Cache problems with FE-Users

[Rudolf Ganglbauer]

Hi List,
I have a serious caching problem when FE-users logs in or log out. None 
of the pages is displayed - I just got an error: No template found!
Only when I clear the FE-cache several times the website works again - 
until the FE user logs out. Then FE cache has to be cleared again.

some dets: t3 v3.8.0, ext: new FE login box, css template made with 
autoparser

Has anyone made similar experience or does anyone have a solution for 
this strange behaviour?

Many thanks in advance,
Rudolf Ganglbauer

www.reiseabrechnung.at