weird. I know I use to crash constantly. I fixed it by updating graphics drivers and running windower as admin.
If you're only crashing in one particular zone...then I'm not sure what could be the issue. sorry D:
Might sound silly but I have heard of other players having this issue. To resolve the crashing they dat changed the warp crystals in there to boxes instead, worth a shot.
Just do a check files in playonline viewer(make sure you select FFXI from the dropdown menu), I haven't heard anyone else having this issue and you're saying it's only in one zone... That sounds like some files in your installation are corrupted/missing.