-ERR Timeout while obtaining a lock on inbox (Mail error)

Recently I had just got Opera set back up with my email addresses, and all of them work... Except for one of them. Every single time I try to connect to it, I get this error:
-ERR Timeout while obtaining a lock on /home/CENSORED/mail/CENSORED.com/jon/inbox
Now I can access the mail in squirrelmail, however its incredibly slow even though the server is under 10% cpu usage, and all other areas on it load fine.

What exactly is wrong and how do I fix this? I've tried 'Repair Mailbox permissions' in WHM, but it doesn't see anything wrong with the account that is having problems.

 

 

 

 

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