I recently started my "Windows 8.1 software test" phase prior to deploy Win8.1 x64 in our organization, and hit the wall with Remote Control.

I have installed latest agent, 11 SP3 with Windows 8.1 update.

When I try to remote control from ZCC using either IE 11 or Chrome, it simply goes back to device details, and does not initiate the remote control plugin.
Theres no issue when using Windows 7 with same agent version.

It does not complaint about the plugin not being installed either.