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You probably know this. The account was not exactly locked. It was just full. The pop-up message you received at login was telling you that, but immediately fixing it by purging deleted messages.
The exact reason why the purge by the external mail client was failing is unclear, but may be because the client was not using Cyrus IMAP correctly. I guess it might have been a bug in Cyrus IMAP, but that is less likely, as the web client was able to complete the purge without difficulty.
This would not have been a major problem, I think, if you (as admin) had been receiving warnings that the account was nearly full.
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