Graphisoft recently made available a Hotfix (build 3847) that fixes issues experienced with IFC Add-On. It is highly recommended that you download and install this Hotfix if you are working on a project, and collaborating with the rest of the design consultants using IFC files. Click here! for the Release Notes for Hotfix (3847) and to download. For more information on Graphisoft IFC Support. Click here!