Zoom mis-behaving in Rhino WIP 9

Zoom doesn’t work properly with my Compact Cad Mouse in WIP9

It just doesn’t do anything when I zoom right in. I have to uuse Ctrl + Drag and that ‘unlocks it’ and it starts working again. This happens every single time I switch viewport and am zoomed in

note : I am working on a file created in Rhino 8, then adjusted in WIP9 and then saved as ‘rhino 8’.. don’t know if that is relevant ?

is this file specific? If you run ZEA (Zoom Extents All) does this perhaps reveal an object in outer space?

If file specific, feel free to send it here

hmm I’m not sure. I can’t replicate this morning in the same file.. I’ll report back if I see repeat behavior.. sorry. Was happening very predictably yesterday, but not at all since I re-booted machine seemingly

issue has returned this afternoon. I have used zoom extents and there’s nothing else outside of the ‘model’ I am working on.. I mean there are hidden elements on other layers which are not visible.. but the element I am working on (and zoom extent confirms) is quite small.

So far does seem to be file specific but hard to be certain.. obvs I am just working (and on one file at a time !)

best is to save the model in the state where this happens and send it to us for inspection.

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will do