Since the last NwN update there have been a number of reports of difficulty with object interaction (Pools, Ladders, Chests etc)
Sorrowkitten & I discussed this with Beamdog and discovered this was a known issue with the last update, and were given assurances this would be fixed in a future update, hopefully within a month.
Given the extent of this problem, the alternative of having to adjust numerous areas to account for the problem would be a large undertaking, and so, for the time being at least we will await the promised fix.
In the meantime I'm told that with a little WASD effort one can still get said object to work (though I couldn't do this with the pools)