Please can anybody help as I have no clues what to do. I was working with a part file
and suddenly I realised that all the tabs on the toolbar have greyed out and cannot be accessed. However, when I open up another part file, it seems to be normal and working again. I do not know whatever I did but I tried saving the problem file, used ctrl q, logged out and on, nothing so far seems to help. What can I do next?