Frequently when I push PD8 to full screen I end up with a blank space that is also tagged with the PD icon. It's unusable and unclosable, but I can switch to it by 3-finger swiping too it using my trackpad.

Exiting PD and restarting usually fixes the issue, but it's an annoyance. I must be doing something wrong since it doesn't always happen, but I'd love to figure it out and make the annoyance go away.
Tech Details:
Parallels Desktop - Build 8.0.18608
OS X - 10.8.4
27" iMac / 2.7Ghz i5 / 12GB RAM / 240GB SSD / 1TB HD
Exiting PD and restarting usually fixes the issue, but it's an annoyance. I must be doing something wrong since it doesn't always happen, but I'd love to figure it out and make the annoyance go away.
Tech Details:
Parallels Desktop - Build 8.0.18608
OS X - 10.8.4
27" iMac / 2.7Ghz i5 / 12GB RAM / 240GB SSD / 1TB HD