Q: Airplay on ATV?

Anyone yet solved the problem of running Airplay on ATV?

I can see the icon on the iPad and it turns blue and looks like it will work but doesn't complete the process

Am running Airplay Yosemite 10.10.5 on an iMac and Airvideo 2.4.6 beta3u2

I see that I get the spinning disk when selecting local screen option and it won't connect to the TV downstairs.

Any suggestions gratefully accepted

Francis