I might as well post this since it might help someone else with the same issue.
The problem is not on my side - it is on my host's side. Little did I know that in addition to the web site size limit, I also had a mySQL database size limit. So even though I was well within my web site and bandwidth limits, my host cut off access to the database because it had exceeded the limit of (gasp!) 100MB.
Time to find a new host...
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