The model is a 2D line drawing that I have imported and set the rendering setting to hybrid as usual.
The file is 20 mB.
I have, for some time set a graphic for insulation as a scene in SU and imported that with no problem. Tonight, I can now intermittently grab the model by using the left button on the mouse but that didn’t wok for the past hour on the stuff I am working on. It did on an older file.
Upload the file to Drop Box and share the link so I can see what you’ve got going on.
Keep in mind that if you have something above the viewport on the page, that can get in the way of selecting the viewport. Best practice would be to turn off the layer(s) for those things that are in the way.