Very strange... 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.
If that still does not help, start a new game and save, use
iZakaroN's SaveEditor to bump the character up a few levels (level 50 = 41,650,000 experience points), re-load the game, leave Joram's house and open the catacombs to level up, then put a few stat points into constitution and skill points into Elven Stamina, sleep and run to Verdistis.
If the new game works, but the latest save does not, there may be a problem in the saved game folder itself. If neither work, it may be a problem with Divinity, in which case re-installing might help. Zip or otherwise backup your saved games folder to another location first, just in case. Then un-install, re-boot, shut down all non essential programs (especially anti-virus), re-install the game, perhaps start the game and see if the problem persists (usually not necessary, but would help identify problems cause by the patch), re-boot, shut down all non essential programs, install the patch, re-boot, shut down all non essential programs, start the game. This procedure is a bit over-cautious, but the best way to avoid install problems.
There is another way you could try getting into Verdistis and the Dark Forest, though even if it helps it might not be a permanent solution.
Teleporting Anywhere, via hex editorSee also;
Troubleshooting and Manual Install Procedure