Are you able to https to the Virtual Controllers IP address? Can you confirm if there has been any configuration pushed down from AirWave which may have removed the Virtual Controller configuration? Can you see all of the IAP's in the same cluster when you access the GUI?
There is quite a few troubleshooting commands which can be run via the GUI if you do not have SSH access. If you access More -> Support it will tell you which IAP is currently the elected Master and has the VC IP. Are you able to access that IAP via the GUI?
I'd start by running a tech-support on the Master IAP, look at the output of show summary and also any information in the logs.
Have you confirmed there is no duplicate ARP entries or similar on the switches for the Virtual Controllers IP address as well?