Had an interesting one yesterday. A while back I booked MEL-SIN-SGN//SGN-SIN-MEL on this deal all on the one ticket flying a combination of Qantas/Jetstar. Bags were checked in all the way through in Melbourne but were told we would have to pick up the Jetstar boarding passes from the transfer desk in Singapore. When we arrived in Singapore we headed to the transfer desk and handed over our passports, the lady banged away on the key board a bit and then gave someone a call. After getting off the phone she said 'sorry I can't issue your boarding passes as it says their is outstanding payment due on the tickets'. I just stated we had already paid in full and other than that not really knowing what to say I just stayed quiet to see what her solution was. Anyway she sent us away to wait, 20 minutes later she called us over and handed us our boarding passes, I didn't question her at all about what had happened and was just happy to have the boarding passes! Will be interesting to see what happens when we check back in at SGN in a few days, hopefully all is fine there.