Neither item editor or the save editor should cause any glitches in the game, at least that I know of.

A few people have run into a problem crashing when entering Verdistis or (less often) the Dark Forest. I have not heard of getting teleported somewhere else, though (or was that sentence two different problems?).

Do you have any older saves that work?

Try deleting all of the files in the '..\Divine Divinity\Run\Dynamic' folder.
This folder is used as a cache for the game. Files are created / copied there from the save game folder when you load, and written / copied from that folder when you save a game. The files will be re-created as required the next time you start Divinity. If there was a corrupt file in that folder, deleting the files should fix the problem.

Game crash upon going to Verdistis / Game crashes when I try to return to Verdistis

Troubleshooting Tips (& manual install procedure)