Morroblivion

My game crashes when I get near the Nerano Ancestral Tomb, which is necessary for part of the main quest. I've encountered a handfull of other crashes at seemingly random places in the wilderness but they've never hindered me actually getting where I needed to go or finishing a quest until now. I guess my question is what is in that area and not elsewhere that would cause it to crash? I assume that it's something installed wrong somewhere even though I followed the instructions pretty carefully, but could this cause a crash? Usually missing or wrong files don't cause crashes, so I guess it could be a mod conflict but none of them affect Vvardenfell so that would also be odd.

Alternatively, are there any other ways around this? I'm aware the Fourth and Fifth Trials can be bypassed altogether if one has high enough reputation and level; can this be done once they've already been started? Or is there a console command I could use just to advance the quest past the stage where the Nerano tomb is needed? I tried no-clipping directly over the entrance and dropping down to no avail.

Thanks. I just want to finish the damn main quest so I can sleep without getting attacked by ghouls.

Edit: Or I guess if this seems like a bug then move this thread as appropriate.