PC locks up after less than a minute in-game

[Xashren]

Update: I may have partially fixed this issue.

I reproduced the crash and searched through dbg.txt for information, and came up with something interesting. The relevant excerpt is highlighted below.
================================================== =======
2009-05-26 09:36:18 Creating window.
2009-05-26 09:36:18 Checking display driver version.
2009-05-26 09:36:19 Activating window.
2009-05-26 09:36:19 Picking a default resolution, desktop is 1920 x 1200, 32 bits
2009-05-26 09:36:19 Ratio is 1.60
2009-05-26 09:36:19 Resolution was capped at 1280 x 720
2009-05-26 09:36:19 Resolution verified 1280 x 720, 32 bits ... diff was 1000 from 0 modes
2009-05-26 09:36:19 Resolution selected 1280 x 720, 32 bits
2009-05-26 09:36:19 CRender::InitDevice: Using 32bit mode.
2009-05-26 09:36:20 CRender::InitDevice: Using vsync 0.
2009-05-26 09:36:20 CRender::InitDevice: Using 24bit depth buffer with 8 bit stencil.
2009-05-26 09:36:20 CRender::InitDevice: HardwareTnL Enabled.
2009-05-26 09:36:20 Using hardware vertex shaders.
2009-05-26 09:36:20 Initializing render system.
2009-05-26 09:36:20 Trilinear Mipmapping available.
2009-05-26 09:36:20 Vertex Shader Version: 3.0
2009-05-26 09:36:20 Pixel Shader Version: 3.0
2009-05-26 09:36:20 Initializing engine internals.
2009-05-26 09:36:20 CRender::InitDevice completed successfully.
2009-05-26 09:36:20 Parsing INI file ./eqlsUIConfig.ini
2009-05-26 09:36:20 INI file ./eqlsUIConfig.ini loaded.
================================================== =======

The default resolution is off. My eqclient.ini settings are for 800x600 in both fullscreen and windowed, yet it is selecting 1280x720 and looking for a default resolution based on my desktop. I set my desktop resolution to 1280x720 and loaded the game. Once in-game I let it idle for five minutes - no lockup. I opened the in-game options menu, set it to fullscreen and changed the resolution to 1920x1200 and let it idle for another five minutes - still no lockup.

It seems to be completely stable now, but damned if that isn't an annoying procedure to have to go through every time I want to play EverQuest. Any thoughts?