Well, I’ve been having a play with MT3, and I’ve had no real problems so far. Still have some work to do to replicate everything I’m doing here, but I’m getting there.
I decided that having spent a lot of time on MT, I’m inclined to stay with it, and paid up. I’ll probably finish tweaking, and then transfer Losing it to a squeaky-clean new installation of MT3 in a week or so….
 Actually, I could have used the free licence for my purposes, but I’d like to be able to use their support service in case I ever really break things, and I like to encourage further development.