SerevanthFallout

I was also having this problem and found that it was related to CBBE. I was using CBBE version 1.7 and CTD every time I tried to enter the cell from any angle to the first Mechanical Menace mission site. I upgraded yesterday to the new version 1.9 of CBBE and the CTDs are gone. I was able to complete the mechanical menace mission as well as two others whose sites had wound up being inside the same cell once the CTDs started. I had also been using Kuuns vanilla to CBBE outfits mod but did not reinstall it as the new version of CBBE includes these. I also believe the CTDs had started prior to my finding and installing Kuun's mod. Hope this is helpful.