Design database file won't open following a runtime error whilst carrying out global changes

My software appeared to crash yesterday afternoon after freezing up whilst carrying out global changes on building fabric. After restarting the programme, I have been unable to open the file I was using in Design database. If I highlight the relevant file, it will show the correct amount of rooms, but when open it, it just doesn't appear on the screen and no error message is shown.

If then I locate the file again, when I highlight it, it shows zero rooms. If I try to open it, I receive a message saying that a user is already accessing the file.

If I restart my computer and go back in to Hevacomp, then it will shown the correct amount of rooms again as if it had been open on my computer, although not visible. A colleague has also tried to access the same file from another computer and has the same issue.