I just talked to M&M in Germany. He can see the cabin as wide open but can't do anything to push it through. He says the system will check every 2 hours until 10 hours prior to departure for I space (I think that's the code on LH - sorry if incorrect). He advised me not to do OLCI and go to the airport to check in there. If it hasn't cleared by then, I can do a paid upgrade at the airport. Strangest system I have ever seen. Lots of room and they are willing to sell it to me at check in but won't let me use a voucher or upgrade now.

I'm a LH noob but it just seems weird that they give you these vouchers then don't really let you use them but are quite happy to take your money at check in instead.