When my hard drive died and I had to have a new one installed, I lost everything. You know, no backup.
The first time I logged back on the Mudcat, I bookmarked the site before I set my cookie. Then I had the same problem you had, I couldn't get logged in because my name and code word were already taken.
This all was before the recent discomfiture. You may want to try going to Mudcat directly and not use a bookmark. See, if that makes a difference.
If you leave, I am sorry to see you go. You will have been driven away by those who want to drive people away. Is that how you want the story to end?
Roger in Baltimore