Wyse 3040 - ThinOS 8.6_511 - Freeze at logon screen (OK with lower firmware)

Currently at ThinOS 8.6_206 with mulitple Wyse 3040 (normal and PCOIP flavor)

i can upgrade to ThinOS .303 and .412 without issue.

But as soon i update to 511, i tried to log with domain credential 

I enter Username and password (domain is already set)

and click "OK"  and it freeze at "loading profile"

i though maybe something was wrong in my INI file config, so i tried only this only line :

 

ConnectionBroker=Microsoft Host=myServerBrooker.com

and same thing !

i have no logs from the Wyse (frooze) or from the broker

im lost...why it works with "lower" firmware" but freeze starting with 511 version