What you have is a common bug that is fixable by downloading and installing a patch.
You can get patches here -
http://archive.gamespy.com/games/871.shtml
You could also check out downloads.com; they have some patches specific to the British version of the game.
There's a thread in this forum entitled "IWD mod list" (or something of the sort) that has tons of useful information on the versions and patches of IWD, mods, and the installation order.
The simplified version is this:
1) Icewind Dale (original version) use the v.1.06 patch
2) IWD with Heart of Winter (known as HoW) - download the free Trials of the Luremaster expansion; it includes the v.1.41 patch for HoW
Only use the patch for the version you have.
And WELCOME TO IRONWORKS!! Hope you stick around. If you have any questions on IWD, this is the place to get info. There's people here who have finished it 10+ times and know the game inside and out.
[ 07-11-2004, 04:26 AM: Message edited by: Aerich ]