Lantros,
The graphical bug you saw in tactical is usually caused by a video driver incompatibilty. Also, one of your crashes occured deep in the graphics system (likely a driver issue as well) I checked your debug.err file and noticed your video drivers are from January 2009. Please try updating your video card drivers. You can check for new drivers for your NVidia GeForce 9800 GT at www.nvidia.com/drivers
After updating your drivers, please let us know if any of these problems continue.
Thank you.