Updated to 7.5.16 on 4 instances of Solo on different sites without any issues in January.
Tried to log in today for updating to 7.6.0.
While login I get following message on 3 sites: Application Error 0: Value Error: Unknown format spezifier "S"
No further reaction. If I click on the message it returns to the login page.
Same behavior with Firefox, Chrome and MS Edge. Image is attached.
Update at one site was ok.
I installed 7.6.0 manually on two sites. Same error.
Thanks for your help in advance.
Kind regards from Germany