Virtual Visit View Problem

[Zero7]

Hi,

Whenever I enable Virtual visit mode and walk around a round (using mouse and WASD) then use the mouse to turn the view, it snaps back to a previous view, almost like it's pivoting around an invisible point in space.

I've never seen this problem before as I could always move, turn, look (in that position) and then move again. Is there a setting somewhere that's causing this?