Hello, I am having an issue all of a sudden.

The drawing that I'm opening is a large assembly, I have had no issues in the past but last week it started giving me problems.

Issue: The file opens up but I dont have any items (sheets) in my navigation window and it reads [viewing] at the top after the file name. I see the sheet tabs on the bottom and i can switch between them. I am unable to delete sheets and/or modify them. I dont understand why this would happen to my computer and not any one else. I thought it was the file itself but I had a fellow co-worker open it up and he had no issues at all.

Please see attached

Thank you in advance for any help

Joel