Retain Unified Archiving 4.9.1
After upgrading to 4.9.1, when users try searching in the browse tab in Retain they are logged out of Retain.
This appears to be a bug and has been reported to engineering.
The workaround is to make sure that there is a field selected to perform the search i.e. Mailbox, Indox, Sent items, Folder. etc.
This has been fixed for the 4.9.2 release of Retain.