Active Home Page menu unresponsive after period of inactivity

We have just upgraded to 10.2.300.2 from 10.1.400.14 and all users are using Active Home Page. We have had some reports of the menu and favorites becoming unresponsive after a period of inactivity. When this happens, they typically have the green ?loading? bar running across the top of the screen. Has anyone else experienced anything like this?

I have a case open with support whereby the Active Home Page just turns fully white after a period of inactivity. I’ve witnessed it on a user PC change to white after approx 60 seconds - only way to resolve is to restart client.

These problems only started after deploying Active Home pages to some users.