I then started normally and it worked fine. I then enabled the addins and it worked fine. So for now it is working but not sure why.Without restarting Windows? Curious - just firing up Outlook in Safe mode and then back to normal mode shouldn't have done a thing. If the problem does end up returning, I'd still recommend checking the video drivers and doing an Office repair. Also take a close look at what add-ins are installed. Any there that don't kick in until something specific is done with Outlook? That might explain the sudden cure.