


The ribbon menu error would be noticeable at this point.Finish editing the part to get back to the sub assembly level, then right click on the same edited part within the model tree and select open.At this point the ribbon pull down menus should still function ok and drop down as needed.Do not open in another window but edit the part in place within the activated sub assembly. Activate the sub assembly, then activate a part to edit within the sub assembly.Open a top level assembly that has at least one sub assembly with parts.Have the ribbon menus fully hidden per this screen capture:.It is not 100% repeatable, but seems to happen after this workflow: I have found that this happens under certain conditions. Specifically, Inventor’s inability to show the ribbon menus when they are minimized. I have been experiencing the Inventor 2021 loss of ribbon menu access.
