When using apps as a second user, why do new screens within apps open behind the main window? I have just set up a second user account on my Nexus 10 (running stock 4.2.2) so that I can keep my work Exchange email account separated on the device. In this new account, the email app works fine in almost all ways, except that when you (for example) open the settings dialog, nothing appears to happen. It is only when you hit the 'back' button that the settings window appears. It's as if new windows are opening behind the original one rather than in front. 

Initially it looked like it was on the Email app with this behaviour, but this morning Evernote has started doing the same thing in that account. This is extremely annoying! It only seems to affect this new secondary user. Everything works perfectly in the primary account.

I've tried searching for people having the same issue but have come up with nothing. How do I fix this?
I did resolve this issue eventually. I use App Protector Pro on the main account of the device, but it is not installed in the second user. Somehow having this enabled on the primary account disrupts the screen ordering on the second and subsequent users. It occurred to me that this might be the case, and testing has proved it so. 

You need to disable App Protector Pro to resolve.