Thanks for your reply :-).
I can’t (and wouldn’t) speak for @Jim_F; as I see it your point is that you wish that solutions to (tech) support issues could be effected sooner.
I’m sure that many people in many situations feel the same; and/or that there were no such things as software bugs.
My fear is that not everyone will reliably translate such phrases (of yours) as:
- a literal show-stopping bug for most users (it isn’t for me)
- zero coordinated response from the support team (after five hours at a weekend)
- Please do better (is such peremptory language courteous?)
- lack of response [is] shocking (weren’t you advised to take the action you have?
- a horrible user experience (agreed not what one wants - but by no means for all users; and if the unique attributes of those who are experiencing it can be identified, possibly easier to fix)
- objectively terrible experience (doesn’t objective imply that there’s no element of the personal in it - and that thus everyone can expect it? I’m on (a later version) macOS and updated to 1442 the other day + this afternoon I imported several dozen files without trouble… no less sorry that others are nevertheless experiencing difficulties, though!)
into: “Here’s a very frustrated user; let’s make sure that he knows that he’s not being ignored”, which is what - if I’m following properly - @Carl carefully did today, Sunday, here.
I doubt that there’s a single user on this forum who hasn’t sympathized with anyone else experiencing downtime. I certainly do. I’ve had a couple of what to me were disappinting malfunctions over the five years since I began to use Roon. One did take what - to me - was a frustratingly long time to resolve. But resolve it they ( @daniel, actually) did. He (and his team) patiently worked to help me identify a corrupted file, which I removed and replaced - and have not looked back 
.
I have a funny feeling that the phenomenon you’re experiencing is already being investigated and will be addressed (as @Jim_F implies) soon. Especially if all the other users to whom you refer are also all using an OS which is five years out of date on hardware a dozen years old with 16 GB Ram (that is, have you checked to see if that combination is supported… the very act of adding files couldn’t be causing the crash because of lack of space, could it?)
There are too many experienced and expert users here on the forum for the phenomenon to go unattended to for long. See this post, for example. Is there anything you notice about the size, filetype or naming of the files you are trying unsuccessfully to add?
Good luck, @Kobi_Eshun.