Bethesda Softworks has issued a new patch for The Elder Scrolls IV: Shivering Isles, bringing to v1.2.0416 the second official expansion for the The Elder Scrolls IV: Oblivion. This update fixes a crash caused by bad form IDs and also fixes an issue where the game would try to use form IDs that were either restricted or not available yet. You will need to uninstall and reinstall Oblivion if you installed any of the Shivering Isles beta patches.