Has anyone found that the tabs on some menus like the popup Display Options don't open if you click on them with an external mouse? They seem to respond OK if I only use the trackpad on my laptop, but if I start using an external mouse, this eventually seems to cause them to become unresponsive to the cursor and I need to restart Houdini. There seems to an issue with using an external mouse, at least with this version (18.5).

I would like to know if there is a fix.

Changing it from trackball mode to 'normal' might help with your mouse situation.

Where do I find the settings to do that?