Email messages don't open

[Gary]

Is this similar to the situation faced by @Louisd in:

Invisible Windows

I’m running 8 on Windows 10 and everything was working until earlier today where I can’t write a new email, reply, forward or anything that requires me to interact with anything but the main emClient window. When I hit the new or reply button a new window appears to be generated (in the task bar I can see a 2nd eM Client window) but the window is invisible. I can click it, it doesn’t pop-up. I can see it when I mouse over but it is just a blank window (see below). I have restarted the client …