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Why is Thunderbird having trouble copying to my "sent" folder?

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Recently I have been getting an error message telling me "Thunderbird is having trouble copying to sent folder. Try again?/Cancel". What might be causing this?

Recently I have been getting an error message telling me "Thunderbird is having trouble copying to sent folder. Try again?/Cancel". What might be causing this?

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IMAP or POP3? Is the sent-folder on server (IMAP) or local? Is your virus-protection scanning to long? Is your firewall slowing down your connection? Do you use any add-on?

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I can't get Thunderbird to save my sent mail either, but there has been no solution posted! HELP!