Thanks for getting back to me.

This happens at random intervals. From me using the aether compass in game (in no specific area), from teleporting to a major city or aetheryte, to just running while mounted. I did a reinstall of the entire game, and so far nothing has happened. Silly me though, found that I had one more overlay running (gosh, too many on one PC), and I shut that down as well. I'll check on the driver for my graphics card, and I'll inform you of any changes.