This has been bugging me for a while.

When tumbling around the viewport, occasionally click ‘alt+lmb’ resets my view to something funky- almost like it inverts.
Alt-G or Alt-H fixes it back to normal but on the modeling heavy project I'm working on it's becoming very frustrating!
Seems to happen regardless of what my cursor is on (mesh, null, point, empty area).

Example of a normal view:


And after ‘alt+lmb’:


The crazy thing is that doesn't seem to happen every time!

On Windows 10
Houdini Indie 17.5.391

I've tried toggling the 3D Viewport Preferences:

But it doesn't seem to help!

Any suggestions or anyone having this issue?

Thanks!

I've said it before… there's seriously something about posting a question to the forums that flips a switch in my brain.

SOLVED!

Twas my mouse! I had my tecknet gaming mouse hooked up- I think it installs some funky drivers or something.
Unplugged it, plugged in my trusty ‘boring’ stock mouse, rebooted, and so far so good!