Thanks for the reply.
Sometimes when I click on my link to the VM email app, I get a totally different screen to the usual one (still logged in to my VM account). This may be happening when the VM app has ended abnormally. I thought that this was a new VM version and usually got back to the 'old' version by rebooting my laptop.
I hadn't taken too much notice previously, but now I think about it, I think it had 'OX' near the top. Could it be something to do with the OX App Suite?
Anyway, it's probably more of a problem with my my laptop configuration than a VM issue.
I'll take more notice the next time it happens and until then I'll go and have a lie down!