Can't move through viewports long enough when VRPhCam active

[Paul Oblomov]

Try it yourself - click on create VRay Ph.Camera, but don't create it in viewports, instead - just try to press and hold ctrl+middle MB/shift+middle MB (dont' forget to move your mouse ) in any viewport (make sure VRay Ph. Camera button is still active). You can for ex. shift+middle MB perspective viewport for a limited time, then it freezes and you have to press it once again, until it freezes again.... so you have to press shift+middle MB over and over again to move through your scene!