Unable to move a certain direction?

In one map in my game, if I step in a section on the left side, I am unable to move right. If I step into a section on the right side, I am unable to move left. I checked the passages in the database and all the arrows are there, but it seems that if I step off the center of the map, I won't be able to get back. The whole map is covered in region to make effective a chase scene event, and I have a suspicion that this is a region problem or maybe even a parallel event problem, as the player cannot step on any events in the map.

I'd like some advice on what to do.

Problem solved somehow. I just fiddled with passage, though I don't know how it works even now.

If you were using a heap of regions, is it reasonable to assume you're also using a script? Might have had something to do with that.