Change the wireless mode to Mode 3 in wireless advanced settings.
Yes, same screen where you turned off 5Ghz.
Whilst your connected to the hub manager, goto Advanced Settings and My Network.
Boot the device your having problems with, can you see the device you're having problems with in the list of connected devices, if so, is the background colour green or grey and finally are there any warning icons alongside it
You have wireless connectivity but clearly not getting an IP address from the hub for some reason. Try disabling and then re-enabling your network adaptor.