yeah..Logitech couldn't help. Once i'd told them that it had learn't the BOSE codes and double checked that it could still pump out IR to other devices (therefore proving the remote still actually works), they pointed me straight back to BOSE again.
I think i'll ring BOSE back up and mention the fact that there are a few of us that are having problems here and ask them whether they are confident in the fact that the BOSE can truly read ANY IR from the display module....I'm just wondering whether it can at all.
It might be that no Universal Remote will work at this moment.

I'll keep experimenting as well...you never know. It took me ages to get the BOSE and Harmony lined up properly to do the original teaching.