The formID bug rears its ugly head after the expansion has been played for a lengthy period of time - between 50 and 170 hours on PC and between 75 and 150 hours on Xbox 360. It essentially renders the expansion unplayable, but thankfully Bethesda has now issued a patch.
PC gamers can head over to the official Oblivion website to get hold of the patch, while Xbox 360 gamers can download the update over Xbox Live.
Direct 2 Drive users will have to wait a bit longer, and those of you that installed any of the previous patches will have to reinstall the entire game then apply the patch.
If you're yet to dabble with Shivering Isles, you can find out much more about the expansion by checking out Pro-G's review.