Kaiser, welcome to the Cayenne community!
My understanding is you are on your Windows 7 computer in Chrome with the Cayenne dashboard up and trying to remote access to your RPi from there. If that is accurate TightVNC should not be needed. For example I connected to my headless unit called RPi Outside, got to the remote Raspian desktop and I don't have TightVNC running.
If I'm misunderstanding your setup please try to clarify, but please be patient, I'm easily confused.
If you are running a X session via TightVNC while trying via Cayenne this maybe causing the problem, you might try the Cayenne connection prior to starting the TightVNC connection.
By the way all of my RPi are running headless, monitors are expensive .