Freeze when making clipping plane in front view (XZ plane)

This is probably a useless post because I can’t really share the model but i’m getting a hard freeze when creating a clipping plane in the front view.

Anybody have any ideas on what might be in this model that could cause that? I can’t see anything visually obvious that is unusual.

I have to make clips in the top view then rotate them and toggle the viewports clipped.

Windows or Mac? OS version? Which Rhino release?

Windows 8
Version 5 SR11 64-bit
(5.11.50226.17195, 2/26/2015)

Are display drivers part of clipping planes? I’m running slightly old Quadro drivers 327.02. Last time I did an update it reacted badly with my machine and it took days to sort out. Can’t afford any downtime right now so I’ve been gun shy on nvidia driver releases.

Can you isolate it to a single object causing this? (In case you have several objects in your scene, that is, of course…)

That’s the path I’m going to go down… I haven’t isolated it yet though.