Please save a SoftRAID Technical support file (Utilities menu) with all disks connected and attach it to your response, so I can investigate.

Does it eject and never come back? How do you get it back to being seen?

My apologies. That was a user error, not a software one. I was still on 13.3.1, not 13.4 Beta. Beta is now properly installed and no panics ensued.

Get me a kernel panic log. If you are getting panics on 13.4 beta, we need to urgently investigate. thanks!

Next time the system panics, on restart, there is a "Report to Apple" option. Click "report", then "details". Copy all the text, paste it into Text Edit. "then make sure you "Make plain text", so you can attach it.

The computer panicked overnight. I do not know what triggered this initial (overnight) panic.

Now I am back to getting purple screen kernel panics reliably. I seem to avoid that if I pop my hard drives out of the bays, boot, wait, then reinstall drives. 

Thanks for reporting this. So far, 100% of user reports say this bug, and another one with using Resolve, are fixed.

I had frequent kernel panics before trying the beta (13.3.1) but since upgrading to the beta, none. Current system uptime is ~120 hours.

Looks good so far!

If you actually got restarts, that is not great. It is an indicator that disks are taking too long to spin up or appear. the 1 minute timeout will help, as SoftRAID will not try to mount until all pieces are present, or 1 minute goes by.

I should mention that this was happening for some time before the 13.4 upgrade on various recent SoftRAID betas. At one point, SoftRaid insisted on rebuilding the raid a couple of times after restarts and that took quite some time. That went away and all I got was the message for a while until just now when I changed the timeout.

This is the kind of information I need to hear! No more panics. I was hoping for confirmation.
Once we get the public telling us it is fixed (which you are number one), then we can tell everyone. We cannot break the news, but can "rebroadcast it.

13.4 *should* fix the DART issues, I am so glad to hear this. Any other users with 13.4, please chime in.

I am not sure on the other, except the SoftRAID driver may load faster now, as it is in /System/Library/Extensions, rather than /Library/Extensions.

Set SoftRAID preferences to (RAID) for the timeout to 30 seconds and see if the message goes away. We may need to tweak this time out if this is the case, to avoid alarming users when there is nothing wrong.