This only happens for movable proxy objects (and "Autoupdate movable proxy" option set to ON).
Of course - only with Octane Renderer and with an active render window (no pasused).
At first the value changes smoothly, and then there is a sudden jump in the value and mouse pointer jump to random ...

Hello
In 3ds max 2107 and 2018, drag any parameter (eg cylinder radius) with high precision (with the ALT key) or with low precision (Ctrl key) the parameter value jumps to strange values (then the mouse pointer jumps to a different place on the screen).
You can not use these keys until I press the ...