https://forums.autodesk.com/t5/fusion-design-validate-document/fillet-problem-assembly/m-p/5667656#M295474 Hi Silvio,<BR /><BR />I meant Fusion thinks the model has some "problems" during re-compute of the history. It may or may not be a false alarm (I need follow up to confirm it).<BR /><BR />Even if it's a real problem, I agree that the error looks strange in such case because just editing and clicking OK can correct it. <BR /><BR />I'm out of the office in the next two days. I will work with the development team to understand the root cause.<BR /><BR />Was the design started from a release before or after March? The information could be helpful for us to investigate the root cause.<BR /><BR />Best Regards,<BR />Nicolas Sun, 07 Jun 2015 13:49:04 GMT NicolasXu 2015-06-07T13:49:04Z