I was running 1680 x 1050 before I installed the patch and it continued to run fine after installing, with no additional edits required. Both of my video.con files (see locations in above post) currently have the same thing in them.
VideoSettings.setTerrainQuality 1
VideoSettings.setGeometryQuality 1
VideoSettings.setLightingQuality 1
VideoSettings.setDynamicLightingQuality 0
VideoSettings.setDynamicShadowsQuality 0
VideoSettings.setEffectsQuality 1
VideoSettings.setTextureQuality 1
VideoSettings.setTextureFilteringQuality 1
VideoSettings.setResolution 800x600@60Hz
VideoSettings.setAntialiasing Off
VideoSettings.setViewDistanceScale 0.75
VideoSettings.setVideoOptionScheme 0
I believe the operative line above is setResolution 800x600@60Hz, but you could try replacing everything with the above and see if that works. If so, then you can play with the rest of settings afterwards. I have an old machine, so my video settings are minimized to reduce lag.
If it starts OK, but then exits after login, then it is probably the video.con file that is causing the problem.
Roy