Yes, I was just thinking that it might be a normal problem, too. I've had issues like that before. Now, I'm definitely no modeling expert (I only really do armor conversions and such), but I think I remember where the option to flip normals is in blender.
Now, you've got your little "Panels" area where you can switch between six different modes (logic, script, shading, object, editing, and scene respectively). You'll want to go to the editing mode and then look in the box that's titled "Mesh". Near the very bottom you'll see a button that toggles normal flipping. Click that and voila!
If that little explanation is hard to follow, let me know and I'll upload a screenshot.