Hey Beon.. 

it seems like it was a permission problem. 

set Files of "API" Directory to 755 and Problem is solved. 

@ Steveland: as i mentioned in my other Ticket the osticketawesome zip release is messed up when unzipping it via Plesk. 
If you unzip the original osticket release via plesk, everything is fine with default permissions. osticketawesome is 644 with all directories by default. Something has been changed since 1.1xxx. 

Hi Kleins,

no, this is not a permission issue. This is an issue in class.usersession.php:

This solved the user logged out issue:

regards

Hi,

This have solve the issue I was having too.

Issue is back.