subbz2k
5
Ok, got it. It indeed had to do with the Cookie Settings. I compared them to the ones i had in the portable Version and noticed one difference:
In the portable Version “Accept Cookies from Third Partys” was set to “Never”. In my main installed version however it was set to “Always”. The moment i changed it to “Never” Elektronauts started working and i can now reply with the correct browser 
Strange thing anyway. But maybe this helps someone if he/she runs into the same issue.
Cheers