I'm pretty new to the whole idea of the explorer ticket and have been 'playing' with various route ideas on the Milage Monkey website. I've read the rules at the begining of the thread and yet I can't figure out why certain routes are coming up as invalid for the purposes of the explore ticket...can any of you guys help?

LAX-SYD-CNS-HKG-BKK-DXB-LON-LAX works fine apparently but as soon as I attempt to incorporate Cape Town between DXB and LON I get an error message....same happens when I attempt to incorporate GIG between LON-LAX.

I've crossed both the Atlantic and Pacific so that can't be an issue, I don't thing I'm backtracking, I'm pretty sure I'm not flying too many segments in one 'continent' and I certainly havent exceeded 16 segments. Apologies if I'm missing something obvious but I'm stuck!