Thanks for the feedback gents, I did think it would be very strange for the plastic theme to be the cause. As I mentioned I haven't changed anything else so may well be a glitch???

I'll re-install and reboot and make sure I reboot a couple of times after fiddling and getting the theme as I want it. Fingers crossed it was just a glitch because I was liking the new themes and customisations...

I'll let you know how I get on.
Cheers