My APs are not able to join any adress if they are not in the same subnet. The default gateway is correctely configured. If I put my laptop on the same subnet than the APs, it works. My R600 are in version 200.4.9.13.17
Unleashed AP only can join into master in the same sub-net. What's your laptop problem? I don't know: If I put my laptop on the same subnet than the APs, it works. --> So what's your key problem?