P: GPU rendering will not complete in Develop Mode at Fit/Fill zoom levels

When making adjustments to photos the spinning "wheel" in lower right never stops and the photo does not render. 
I've found a workaround which is to zoom in while rendering. Then the photo renders 100%. 
Tried several things to try and solve this but without any luck. 
Please help!

I guess it is the same problem as I described, and this cannot be fixed by the config item "smart preview" - see my observations here: https://feedback.photoshop.com/photoshop_family/topics/lr-7-3-1-often-not-updating-rendering-in-full...

Hardware environment

CPU: Intel Core i7-3770K
GPU: MSI NVIDIA GeForce GTX 670 (391.35)
RAM: 16GB

Software environment

Windows 10.0.16299
Lightroom Classic CC 7.3.1

Problem description

After updating to Lightroom Classic CC 7.3.1, images to not load correctly:





Workaround

Zoom in and then out again:



Disabling the graphics processor does not solve the problem: Edit → Preferences... → Deselect "Use Graphics Processor".

Updating to NVIDIA driver 397.64 does not solve the problem.

Testing description

Reproduced in Lightroom Classic CC 7.3.1. Issue can be reproduced reliably upon restarting the computer.

Best regards,

Louis Vallance

The spinner is only relevant when the GPU acceleration is turned on. You don't always see the spinner if the image loading completes quickly. There is a set delay timer to trigger the spinning icon to display. If image loading completes before the delay timer fires, there would be no spinner shown. 

Does the Lr freezing part happen when the GPU acceleration is turned off?

It may be the same issue I observed in different flavours also on latest OsX HighSierra and LR 7.3.1. Though it does not depend on GPU acceleration. I observe the issue in many cases (but not always), mostly after having done multiple view switches and editing. Mostly I don't see the spin icon though. I had it once and then finally LR froze. Usually I can continue working but I am keeping zooming in/out to get an updated view.

My machine setup:Lightroom Classic version: 7.3.1 [ 1167660 ]License: Creative Cloud
Language setting: en-DE
Operating system: Mac OS 10
Version: 10.13.4 [17E202]
Application architecture: x64
Logical processor count: 4
Processor speed: 3,2 GHz
Built-in memory: 24.576,0 MB
Real memory available to Lightroom: 24.576,0 MB
Real memory used by Lightroom: 8.419,8 MB (34,2%)
Virtual memory used by Lightroom: 18.444,2 MB
Memory cache size: 1.511,1MB
Internal Camera Raw revision: 933
Maximum thread count used by Camera Raw: 3
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 2387MB / 12287MB (19%)
Camera Raw real memory: 2433MB / 24576MB (9%)
Displays: 1) 2560x1440

Graphics Processor Info: 
Metal: NVIDIA GeForce GT 755M

Bingo!  That's exactly it.  Thank you, Simon and Rikk.

Do you have the Lightroom preference setting "Lightroom>Preferences>Performance>Use Smart Previews instead of Originals during image editing" turned on?

If that is the case and the spinning icon does not go off, it is an indication that you don't actually have the Smart Previews generated for those photos. This is a known issue and will be fixed in the next Lr update. 

For now, you can ignore the spinning icon for this case, it is a false alarm. Alternatively, you can force the Smart Previews to be generated ahead of time when turning on such preference settings.

I should have updated my question.  I just switched to 7.3.1, and the problem remains.

Correct. If you had ended up being a Windows user, you would have a driver you could check/update independently.  Have you tried the 7.3.1 update yet?