P: Cannot merge panorama after updating to 10.14.6

For those experiencing this issue, please check your free hard drive space. 

Another FYI (and I know this is non-specific, but...), until the last couple of days (i.e. the time I upgraded to 10.14.6) I had no real lag or performance issues with LR. However now in general use I get frequent spinning wheels and general slowdowns when just browsing the catalog etc. So that potentially backs up the theory re hardware related issues.

FYI I've already tried purging the camera raw cache and disabling the GPU acceleration. 

I'm having the same issue with 2 devices - Sony camera and DJI drone. Have copied the sys info below.

Thank you so much for having a look into this... it's driving me nuts! I've copied the header, let me know if you need the rest...

Lightroom Classic version: 8.4 [ 201908011719-03751b60 ]License: Creative Cloud
Language setting: en-GB
Operating system: Mac OS 10
Version: 10.14.6 [18G87]
Application architecture: x64
Logical processor count: 4
Processor speed: 3.3 GHz
Built-in memory: 16,384.0 MB
Real memory available to Lightroom: 16,384.0 MB
Real memory used by Lightroom: 450.6 MB (2.7%)
Virtual memory used by Lightroom: 11,382.9 MB
Memory cache size: 561.5MB
Internal Camera Raw version: 11.4 [ 273 ]
Maximum thread count used by Camera Raw: 3
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 5001MB / 8191MB (61%)
Camera Raw real memory: 5005MB / 16384MB (30%)
Displays: 1) 2880x1800

Graphics Processor Info: 
Metal: Intel(R) Iris(TM) Graphics 550

Guys, a long shot, but can we get the contents of Help menu > System Info please? I can't reproduce it either, and I'm wondering if there's a hardware element that's shared across your system. Also, the camera used to capture the photos might offer some extra clues.

Lightroom Classic now hangs when creating panoramas. The issue started while on 8.3 but I have now updated to 8.4 and still have the same issue. LR Classic been reliable for months but I now can't create any panoramas within Lightroom. The same images will merge within Photoshop (if I merge the HDR's prior to Photoshop) or PTGUI, but I prefer to stay within lightroom as it creates an ARW file. Depending on the file set, the preview step can hang, or it  can hang during merge. HDR still merges ok.  

Lightroom Classic now hangs when creating panoramas. The issue started while on 8.3 but I have now updated to 8.4 and still have the same issue. LR Classic been reliable for months but I now can't create any panoramas within Lightroom. The same images will merge within Photoshop (if I merge the HDR's prior to Photoshop) or PTGUI, but I prefer to stay within lightroom as it creates an ARW file. Depending on the file set, the preview step can hang, or it  can hang during merge. HDR still merges ok.  

Lightroom Classic 8.4 was released yesterday. Please try installing this update and seeing if you still have issues with the panorama merging. So far, as a team, we've been unable to reproduce what you are experiencing. 

If, after the update, you are still seeing issues, then we need to get some detailed information from you regarding your OS version, free disk space, etc. 

You can easily downgrade your OS using a previous Time Machine backup. That said, hopefully Adobe recognizes the problem and solves this sooner than later.