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Seems there can be many things causing trouble with mods working correctly. But also many fixes. 

Let us sum them up:

1. First make sure you have Steam set up correctly for Texmod:

Snipe's Guide for Steam

2. Try changing Texture and World Detail Settings in the Launcher (not ingame) to High

(sebway2k3 found this out)

3.Try using Compatibility Modes: Windows Vista SP2 and maybe others (right click Tombraider.exe go to Properties to access it)

(Fakk22011 reports this solved all problems for him)

4. If DOH error appears when trying to start game with Texmod: Try to disable your anti virus software, this often works.

5. If you use Nvidia GPU, get latest drivers, they seem to have problems with Tomb Raider 2013...