Usually the errors are due to not enough memory and/or video memory.
You might have to use smaller (Kbyte size) image files that the mods sometimes use.
Also with widescreen, unless the mod has centralised (screen centre) all the image GUI's, you're going to get offset and also distortion errors as the each resolution requires it's own aspect ratio.
There are a few common aspect ratios that'll work well, but oddball screen resolutions are a nightmare.
