I am experiencing the same behavior running TB 16.0.2 under Ubuntu 12.04. IMAP keeps downloading but not writing into the folder and after a few hours google is banning my account for excessive usage. While I was using TB 16.0.1 the filesize of the IMAP folder was constantly increasing. This is a serious problem rendering such a critical program mostly unusable.
I am experiencing the same behavior running TB 16.0.2 under Ubuntu 12.04. IMAP keeps downloading but not writing into the folder and after a few hours google is banning my account for excessive usage. While I was using TB 16.0.1 the filesize of the IMAP folder was constantly increasing. This is a serious problem rendering such a critical program mostly unusable.