WPA/WPA2 with my Nexus 7 I have this weird problem with my Nexus 7:

When the WiFi network on the home router (AirTies) is set to WPA/WPA2 it is always stuck in the "login" phase and never actually connects to the network. The network icon shows that it continuously connects and disconnects.

Now if I switch the network to WPA2 only, the Nexus 7 connects fine. But then, a Mac on the same network keeps forgetting the network and I have to insert the key by hand every time it boots. Switching back to WPA/WPA2 simply reverses the problem.

I accept even suggestions to switch the ADSL/WiFi router, provided that you suggest one that you know works for both machines.
I've read about that phenomenon of some Androids having trouble in mixed WPA/WPA2 mode a couple of times now. As you described, people solved it by using either WPA or WPA2 (or even WEP).

So WPA2 only you tried (but got trouble with your Mac). Any chances to pin it to only WPA? WEP would be a last-ressort, as it offers only marginal protection.

Remark: Not sure about your settings for this, but in some cases people had SSID broadcast turned off on the router; turning it on again (i.e. broadcasting the SSID) solved the issue for some of them.