Lightroom Classic: Fails to import photos and stalls out on macOS 10.15 Catalina

Onyx for Catalina is out: https://www.titanium-software.fr/en/onyx.html 

I’m sorry if I sound ignorant here, but what exactly is onyx?

Not at all, Melissa! It’s a Mac utility that can fix many Mac ills by deleting bad caches, bad application states, font issues, etc. Unless you want to pay for pro Mac IT (which is often a good idea!), you have to be your own Mac Doctor! Here’s my instructions:

In Onyx run almost everything in the Maintenance tab, deselecting things you may not want deleted, like Launch Services . Hit the "Options" button and deselect more stuff like Cookies & Other Site Data, Browser History, Form Values, etc. that you don’t want deleted. If you don’t know what something is, google it, or don’t run it, or ask me), then hit Run Tasks. After it's done it will ask for a reboot.

Victoria, I am subscribed to your work. Please take a look at my comment below. Any advice much appreciated. 

Can I go back to previous mac operating system or should I wait for Lightroom Classic to "adjust"to new Catalina?

Jens, same question applies. How are you importing? From the hard drive? Or via a card reader? Or direct from the camera?

And how far do you get? Can you see the thumbnails in the import dialog? 

I am importing from SD-card directly in the computer. Also tried copy files to Imac harddrive and then import, same issue though.. I cannot see thumbnails, and progress bar stop directly. Also Lightroom crashes most of the time..

I found today exactly the same problem: Lightroom on my Imac is not importing my files after updated with Catalina.
I was trying to import from a card, not directly from the camera.The card was  a new one ( Ext Pro). I repeated with another card and the same problem happened !

I'm having same issue with imports from SD cards to new iMac - files don't complete - shows exclamation mark and error. Thought it was a corrupted card, but works fine on older MacBook Pro running an older version of LR CC. Both computers have been upgraded to Catalina (bad decision) but laptop is working, and the iMac is not.

Inspect/replace card reader?

Can you grab us a screenshot William? I'm particularly interested to know whether the card is selected in the Devices section or the Files section of the Source panel, and whether selecting the other makes a difference for you.

Useful, thanks. If you open the Untitled volume further down and click on a folder in there, do the thumbnails then show up?

Hi Victoria, I hope you are able to view the screenshot. I clicked 'device' on the left sidebar but none of the image files are viewable. This has never happened in LR Classic (desktop) till I installed OS X 10.15 Catalina. If i click on 'untitled' at the bottom, nothing happens.

Nothing drops from clicking 'untitled'.

And on the left, are you clicking on that DCIM folder?

To expand on David's reply a bit, look down the left to Untitled (which is your memory card), click the arrow to expand and click on the DCIM folder to view the photos inside. There's two different ways of accessing the photos and the "devices" one is broken on Catalina but the other works.

We tried this as well and still getting the error screen I posted above.

Hi Melissa/ Yann,

Is it possible for you to share the raw images? You can send dropbox link to mayugupt@adobe.com.
Also if possible, can you try to import images from another sd card? 

Thanks
Mayuri

Tried a different card with different images, still doesn’t work.