BlackScreen after going to Start Menu

Hi,

I just got Win8 and Rebellion has been running great.  However, today I accidentally hit the "windows" button bringing up the Start screen.  When I went back to Sins the screen was totally black and I was unable to recover the screen, although the game still kept playing...well I still was getting messages about my colony being created and my research completing, so I assumed it was still playing.

Anyone else have this problem?

Thanks.