You should be able to click on a pile of gold and specify how much to transfer, though that is much slower than the balance button. I never ran into this problem or have seen it mentioned, so hopefully the patch will fix things up.
If not, before resorting to a re-install, try deleting the files in the dynamics folders;
'..\Beyond Divinity\Acts\Act1\Dynamic', '..\Beyond Divinity\Acts\Act2\Dynamic', etc.
These folders are used as a cache for the game. Files are created / copied there from the save game folder when you load, and written / copied to those folders when you save a game. The files will be re-created as required the next time you start Beyond Divinity. If there was a corrupt file in that folder, deleting the files should fix the problem.