Jenny and Marian,
After playing with the "tex.ini" file for about 3 hours with no success, launched the game and after the intro scene, I was in Tex's office, so I put the cursor immediately to the top of the screen. I clicked on the CONFIG tab,, then on PREFERENCES, then to ADVANCED PREFERENCES and changed the VR RENDERING option from HARDWARE to SOFTWARE. Got a message saying "changes will take effect after restarting the game". Then the game crashed, so I launched it again, and because of that change, the game is running perfectly. no need to change anything in the "tex.ini" files, after all.
Apparently, GOG was not aware of this, so I will contact them again, to tell them what I did to correct the problem with this particular game. i'm sure I'm only one of many buyers of this game who have contacted GOG pertaining to this. WHEW!
Sandy (exhausted) LOL