Q: I accidentally added a new revision, rev E, but it should be rev D. I tried to delete revision E, but it would not let me delete the current revision. How can I fix this?

A: Follow these steps:

1. From the revisions screen, delete revision D if it already exists.
2. Add revision D as the new (current) revision.
3. Delete revision E.

Essentially, you are not able to delete a revision that is listed as the Current Revision. You can temporarily set another revision as current to be able to delete other revisions. Once your data has been cleaned up, you can set any revision as the current revision.