[MrSteve]

Hi guys, i just set my computer up in the way you have explained above, and i got the same message even though i have been happily texturing my models for a long time, i suggest you try this. I might sound insane but its the only i fixed the problem.

Move your "Textures" folder out of AC3D 6.2 folder in programs and keep them somewhere else i.e my documents. texture the model again and save it and try to open again. let me know the results.

Good Luck!