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I don't think that just a Windows update could do this.

I know so we are waiting the citrix answer. But can it be a synchronisation between the ddc and the database ? how to figure it ? i will check the event log this monirng with my client and ceck some powershell. I will let you kno

check the event logs on the bad DDC for 1200/1 errors to see if it has lost connection to the SQL databases. You could also run get-brokercontroller and check the status of the bad DDC , I would also check the FMA service statuses on it via the get servicestatus commands get-command servicestatus* and copy and paste each one and run it. I would do the same for the DB connection strings via get-command get-dbconnection

weird think....reboot server...all good. my client will check the error logs if we can find some