Layout Thumbnails blank and won't print or save to pdf

Hi All. Im using an updated Rhino6 for Mac. I have several layouts created, however some of the thumbnails are blank and will not print or save to pdf. This doesn’t happen on all of them and it happens to different layouts at different times. I can share a screen that shows the layout is visible in the viewport but not in the thumbnail. This doesn’t happen in the Rhino7WIP but it crashes after a few commands and is impossible to work with at the moment. Any assistance would be greatly appreciated.

Hi - can you please run the Rhino SystemInfo command and copy-paste the result here?
Also, please post a 3dm file that shows that behavior.
Finally, when the Rhino 7 WIP crashes, are you sending in crash reports?

Rhino 6 SR25 2020-4-23 (Public Build, 6.25.20114.03572, Git hash:master @ f35d7ded15ec317635ced435d8df84327397038d)
License type: Educational, build 2020-04-23
License details: Cloud Zoo. In use by: Mike McKay ()

Apple Intel 64-bit macOS Version 10.15.4 (Build 19E287) (Physical RAM: 16Gb)
Mac Model Identifier: MacBookPro14,3
Machine name: Michael’s MacBook Pro (2)
Language: en-US (MacOS default)

AMD Radeon Pro 560 OpenGL Engine (OpenGL ver:4.1 ATI-3.8.24)

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On

Anti-alias mode: 8x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: Height

Vendor Name: ATI Technologies Inc.
Render version: 4.1
Shading Language: 4.10
Maximum Texture size: 16384 x 16384
Z-Buffer depth: n/a
Maximum Viewport size: 16384 x 16384
Total Video Memory: 4 GB
Graphics: Radeon Pro 560
Displays: Cinema HD (99dpi 1x), LED Cinema Display (94dpi 1x)

Graphics processors
Intel HD Graphics 630 (1536 MB)
Radeon Pro 560 (4 GB)
LED Cinema Display (1920 x 1200)
Cinema HD (1920 x 1200)

USB devices
Apple Computer, Inc.: Apple Cinema HD Display
Logitech: USB Receiver
Apple, Inc: Apple Keyboard
Apple Inc.: Apple LED Cinema Display
Apple Inc.: Display iSight
Apple Inc.: Display Audio
Apple Inc.: Apple T1 Controller

Bluetooth devices
Nordic Semiconductor:

Third party kernel extensions
com.parallels.kext.vnic (15.1.4 47270) 6A368CDB-25CE-3D1C-AFD2-830348A37397
com.parallels.kext.hypervisor (15.1.4 47270) 2808E2EB-57ED-3AA0-8103-B2F97805D5EC
com.parallels.kext.netbridge (15.1.4 47270) E484B890-DC3D-3C33-B052-929FED5F9BEE

Third party plugins

Rhino plugins
/Applications/ “RhinoCycles” 6.25.20114.3572
/Applications/ “Snapshots” 6.25.20114.1002
/Applications/ “Grasshopper” 6.25.20114.3572
/Applications/ “PanelingTools” 6.25.20114.1002
/Applications/ “AnimationTools” 6.25.20114.1002
/Applications/ “Commands” 6.25.20114.3572
/Applications/ “Renderer Development Kit” 6.25.20114.1002
/Applications/ “RDK_EtoUI” 6.25.20114.3572
/Applications/ “Displacement” 6.25.20114.1002
/Applications/ “IronPython” 6.25.20114.3572
/Applications/ “Rhino Render” 6.25.20114.1002

Thanks Wim. Below is a reduced file but the problem still shows up. I will send crash reports in a few minutes for 7 WIP. Appreciate the help.Layout problem.3dm (19.0 MB)

If it would be helpful I could speak directly to McNeel tech regarding crashing issues with Rhino 7 WIP? I sent in reports today but they were happening too frequently to continue.

If the layout viewport is set to Shaded (instead of Rendered), then I am able to save the layouts to PDF.

I have seen this when the Layout itself is no set to Wireframe.
It’s not supposed to be possible (there’s no U/I to do it), but it happens infrequently.

In one of the problem layouts, without a Detail active, type:
Make sure it is in Wireframe.
I suspect yours are not.

Any luck?