I have recently installed Mavericks and since then I have been unable to shut down or log out of my mac.  I work with two screens and now I seem to have programmes at the top of both screens which I didn't before.  any advice?

I have recently installed Mavericks on my desk top and since then I have been unable to switch off my computer without crashing it. I work with two screen and now I seem to have the menu bar on the second screen as well which I did not have before.  Can you please help me?

Dr Bettina, I had similar problems with Mavericks. I installed it on a Mini and a 13" MacBook Pro. I can't speak to your disdplay issues, but I can confirm the inability to logout, shut down, or restarft without a forced, power button shut down. I can also report frequent System Prefs freezes and finder issues, like folder contents taking half a minuite or more to render, or not appearing at all. And while a few Adobe CC apps actually ran faster, InDesign ran like molasses uphill in Decemner.
I tried uninstalling or disabling numerous 3rd party apps and pref panes. I unplugged everything but the keyboard, ran DiskWarrier, repaired permissions, did fsck -f, trashed various preference files, reinstalled the OS... You name it, and I tried it — short of a potion using eye of newt.
After two days of totally hosed productivity, I restored OS 10.8.5 on the Mini so I could actually get some work done. However, I've decided to leave Mavericks on the MBP as a sort of crash dummy, and will install and thoroughly test all updates until stability has been achieved. Then — and only then — will I upgrade the Mini to Mavericks, even if it means waiting 'til a .2 or even .3 update.
Good luck to you...

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