Since update Strato IMAP not working

Since the last em client update, I cannot donload mails from my strato imap account
Server does not accept request-

Strato is up and working
No problems with webmail and Thunderbird
So teh problem must be emClient…

Can you completely disable any anti-virus, firewall, proxy or VPN, then try again.

Deactivated avast virusscan and it worked
Activated avast again and seems to continue working!
Hope tomottow it still works!

Thank you for your help!