I have to double post but I want to bring attention to the matter... Right now as I'm typing I'm trying to replicate the crash...
1. I have just generated a scenario, with 1 x 1 outdoor section and 1 medium sized town.
2. Edited town terrain.
3. Placed monster.
4. Edited monster and assigned a personality.
5. Created a personality for said monster.
6. Added dialogue which destroys the monster and creates a portal when triggered.
7. Added another dialogue.
So far so good, usually crashes at this point when I mess around.
8. Added scenario details.
9. Added opening dialogue.
10. Created new town, medium sized.
I was expecting it to crash at this point, I decided to close the scenario editor and reload the scenario. Then I saved to see if it was still working and lo' behold, Error Number 102, then Error number 103, and finally crashed.
I reloaded the scenario to see what's up and it is no longer recognized as a BoE scenario.
This might have to do with the new way the files are arranged, so an older version of the OBoE scenario editor might work. Unfortunately, it's nowhere to be found.