I have noticed on several occasions both my joystick and mouse will not function when starting a battle. I either have to run task mangler to shut down WOWP and restart or reboot my system entirely.
When this happens, my mouse does not work as a fall back item. It is non-functional as well. Some keyboard keys will work.
This has happened about 3 or 4 times so far.
Windows 10 Pro 64-bit, Intel i3 2120 processor, EVGA 750Ti- 8GB RAM, all non essential processes shut down.