CRPG Risen received just two small patches on PC; unfortunately many bugs were left behind, though the overall experience was still quite polished. In any case, as ever, the community is here to improve the experience: World of Risen user "PowerGamer" has just released an unofficial patch which fixes a reasonably long list of bugs, and all of the ones he was aware of and willing to fix.
Work was based partly on the fan-made RisenSDK and other editing tools, which "provided some help in understanding the inner workings of Risen code", so this isn't just slapped together.
The author notes many of the bugs were reported long before the 1.10 patch was released, and a good lot of them could have been fixed in minutes. Sad story.
Grab the patch at the source and if you like, view the changelog. And if you're interested in the modding community, ModStarter is all you need.