Unable to assign imported nodes to a specific forum/taxonomy term

I'm using Feeds with MailHandler to enable users to submit a form topic via email. It works really well right apart from the fact that the post does not appear in the right forum. It looks like two entries are being made into the term_node table for the node, one with a tid of 0 and with the correct tid.

Judging by other posts on this or similar issues that I've found, this looks to be a bug. I'm not a code, so I can't fix this myself, but it is a showstopper in what is an important module. Is this likely to be fixed? Anyone out there come across this and managed to fix it, and willing to share?

Otherwise my only option seems to be to drop use of Feeds altogether and drop back to an older release of Mailhandler - with a set up that I know works.