In Infraworks 2014, there seems to be some severe caching issues. Once the program detects an error (usually due to .fbx textures), it logs it in it's cache and appears to load the same error on every refresh. The only way I've found to fix the issue is to completely regenerate the model. This works for a short period, until a refresh is made, then the same errors come back. The errors cause all or most of the .fbx models loaded in to not generate. If anyone has a fix for the issue it would be much appreciated! Cheers