I had the same issue with Evolution 3.2.1, and solved deleting the file folders.db inside ~/.local/share/evolution/mail/1295611670.31535.6@cvs28.
So now the folders.db is no more in evolution/mail/imap, but in evolution/mail/GUID.
I had the same issue with Evolution 3.2.1, and solved deleting the file folders.db inside ~/.local/ share/evolution /mail/129561167 0.31535. 6@cvs28.
So now the folders.db is no more in evolution/ mail/imap, but in evolution/ mail/GUID.