Upgrade after change
 

After you change a ticket for some bizzare reason unknown you cannot change it again online

why is this

also can you get upgrade offers on check in or does this booking state hamper me doing this

i am booked into flex Y and going gla to dub as a silver

It's a known issue here that only a single change is possible online. Subsequent changes can be made by calling in. I haven't seen any evidence that ticket changes impact upgrade offers.

Thanks!