Heya,
Sorry for the inconvenience of having to create a new account, I do apologize.
We've got some extensive anti-spam measures. With cause: we've blocked more than 1.4 million spam accounts so far automatically, and almost 200k more manually.
My presumption is that your old account was wiped in a manual purge. It's where I manually delete accounts that are flagged as a spam account due to either the email address or IP used during creation. I do those 500 at a time, usually when there's about 3000 or so flagged. I also sweep the existing user database to see if anything slipped by.
My guess is that the IP you used to register was subsequently used by a spammer. That happens. Right now your account credentials aren't being red-flagged by the spam filter, so a future deletion seems unlikely.
Should it happen again (and I really hope it won't), please feel free to contact me directly in case there's trouble signing in again. Now that you've posted, it should be less likely that you'll get caught in another sweep.
Paul