Hi, this is a persistent issue in certain files - not all. The file crashes on rotate or dimension commands and the file itself might have some inherent inconsistencies, e.g. - It has multiple copies of the same xref linked to the file (7 copies of the Plan - one for each Section) and the file itself had some objects in the z-axis, that were then removed or edited out. However, the crashes continued after this fix and the sections had to be distributed across multiple files to work around the crashes. Is there any advice on what is problematic in the original file?