There is a conflict particularly with selection tools when using Photoshop CC in conjunction with airplay on a mac. I use this to project my monitor to a HD TV screen while teaching photoshop. There are other conflicts but selection is the biggest problem. This is not a problem with PS CS6.
If you have Photoshop 14.2 or later, launching Photoshop should create a file called sniffer-out.txt in the folder /Users/YOURNAME/Library/Preferences/Adobe Photoshop CC 2014 Settings. If you post the contents of that file we might be able to learn more about what is happening.