[2020] A few Level/Texture load issues

Texture loading is, I believe, dictated by the efficiency of your VRAM, leading me to believe this could be more of a localised issue with the GPU.

A clean driver re-installation can solve many problems: https://support.fatshark.se/hc/en-us/articles/360021233554--PC-How-to-perform-a-clean-re-installation-of-your-NVIDIA-GPU-drivers