If client in affected state, when there is no icon Troubleshooting accesible via SymCorpUI shows Server - Offline. But on manager console it shows online, responds to console commands like workstation restart etc.
If i launch Troubleshooting right after restart it shows connection to management server, without errors.
If i downgrade to 11.0.6300.803, everything comes back to normal. Maybe i just shouldnt upgrade? Is there a point to do that in first case?