If you’re using iClone and the space mouse, space navigator, space pilot, or whatever else we call it from 3DConnexion, is causing a runaway viewport. Like these guys…
https://forum.reallusion.com/FindPost513550.aspx
I solved my issue by going to Preferences > Gamepad Settings, and unchecking Activate Gamepad. It would seem that Activate 3DConnexion and Activate Gamepad cannot both be checked, or the viewport will spin out of control.
Give it a try, see if it works for you.
