Taskbar showing in MythTV - not compiz
I (finally) have my screen resolution set properly, but the top taskbar still shows while I'm in Myth on my TV. I've read elsewhere that it's either because of compiz, or the GFX card. So far as I know, since it is just the standard XFCE desktop, there is no Compiz. How do I know if it is the GFX card, and how do I fix it. Alternatively, is there something else that can help?
AMD Athlon 64 X2 4400+ 2.3GHz Dual Core, ASUS ATX AMD Motherboard, CORSAIR 4GB RAM, EVGA 512MB GeForce 9500 GT, 1.5TB mirrored RAID, 30GB primary drive, pcHDTV and Hauppauge 1600 tuners. Yeah, this hasn't been accurate for a long time.