I noticed that when I tried to get in some places (like the empty 'fireplace' in the crypt, that becomes empty when you take some loot, like the Mastus sword?) I could not. Then I made my pixie the active character and walked right in. I noticed a similar effect on horseback, when trying to clear a low hanging branch ... I switched to the pixie and viewpoint dropped a bit, but apparently not enough ... I still could not get under the branch.
You might try that (if ya got a pixie
)
Tools for your Wizardry(r) toolkit