It happens so often that I wrote down what to do.
In the case where the central file has been accidentally upgraded or some other equally bad thing has happened to the central file, a local file can be used to create a new central file. Find a person on the project that has not synced with central and has a very recent version for a local file that can be turned into the new central file. The user with the good local file must;
- Open the local file directly remembering to detach from central on open.
- 'Save As' overwriting the bad central.
- Open Options in the Save As dialog to ensure the "Make Central after save" is checked.
- All users must create new locals to continue working on this project.
Not so bad, considering the alternative.