There seems to be an issue with Nibelheim which crashed the game entirely no matter when and how. The second time you return there in present, you enter from the world map and the game just freezes at black screen with music playing, nothing happens and then the game stops working. Tried it about 5 times in a row, and the result is always the same.
I've had my R06c w hotfix11 included backup folder, just copied the save file there, and it works correctly with no issues at all, this is 100% an R06d problem which makes the game unplayable.
Do note: that in both ocasions, i have ArtTsuki fields, battles and world map textures installed, but i guess i doesn't matter much since in R06d it crashes, when in R06c it does not.
Also, both Options.ini in both versions are identically the same, but with only one change in R06d, which is the audio.log disabled. I can provide some files then if needed, but... um, not sure how to attach files here, but, if they're required, i can try to do something about it. Maybe other people can also check if they have this issue or not, but, again, i've no issue getting into Nibelheim on R06c Hotfix11.
Edit: Okay, now, trying it again, i've noticed the message that pops up:
Hey, fool...
I thought i told you there was no gettin' offa this train we're on!?
Please provide your save file, App.log, Reunion.log, and Crash.dmp when
reporting this error to DLPB.
Guess i'll have to learn attaching files now...