Closing the Viewer or logging off the RU Server does not affect the information on the Host version contained in the Viewer. The version number of the Host is cached at the moment of the latest logon to the Host. Please try performing re-logon to the Hosts and see if the problem persists.
This is not very good default behaviour. You need to add the version callback after the upgrades so that the updated version string is updated and shown automatically. It should be part of the successful upgrade verification step.
I can't get over how frustrated and confused I was when simple updates appeared to be successful but kept showing the old version. There is absolutely no other software I can think of that behaves this way.
Yes, you are absolutely right. We are planning to add Host version check in the online mode in one of our future updates. Meanwhile, we will partially implement this system in the nearest update which is due in a few days.