I have several files that have been saved that will not open back up. The dialog box stated it is unable to locate the file and asks to search for it or suppress the item or the all parts.

I have come across several of these issues I am not certain if it ties into another issue. When sketching with sheet metal Base Flange when you complete the sketch and it is converted to a sheet metal view once you hit the check mark the screen flashes a few times and displays an excel window in part of the screen. It appears to look like a properties window. This has started today out of the blue. If any one has a suggestion for one or both I would appreciate the help.