Using the Mac migrating software will break Roon. Best to install new and restore a backup.
Not migrating. This is my existing MacOS 10.15.7 instance. I suspect I didnāt do a clean install. More just deleting the Roon server folder in the library and reinstalled the server app
Roon Core Machine
Mac mini (late 2012) running macOS Mojave. 2.3GHz Intel I7/ 4GB Ram
Networking Gear & Setup Details
Ethernet
Connected Audio Devices
Oppo 205 as end point. Control via iPad. iPhone / Notebook
Number of Tracks in Library
Description of Issue
After not using for a week, could not connect to Roon Core. Tried rebooting Mac mini and reinstalling Roon Server but still saw issue. Checking one Roon software on Notebook see that core is stuck on āinitializingā
I see there have been a few posts recently on this recently, but the only solution appears to be to run the full Roon software instead of the Roon Server. As this Mac mini is getting. little old and slower, I don 't really want to do that.
Is this a bug that has been introduced in the recent update. All worked fine a week ago.
Roon Core Machine
Mac mini (Late 2014) with 1.4GHz Intel Core i5 / 4GB DDR3 running macOS Monterey (v12.4)
Networking Gear & Setup Details
Wifi router ZTE VDSL CPE (ZXHN H168N)
Mac mini is connected via USB to DAC, remotes are operated via home wifi (wifi network works as usual).
Connected Audio Devices
Primare DAC30 on USB
Number of Tracks in Library
approx. 7.000 tracks
Description of Issue
Iām using Roon for over two years without any problems, dropouts and connection loss occurs occasionally, but restarting the device (Mac, iPhone or DAC) always helps.
Until yesterday, Roon on any device has not been able to find the Core. I did do nothing, it just worked one day and the next morning it didnāt.
So I have restated devices few times without any success,so Iāve updated macOS to the latest release and re-installed the RoonServer app but NOTHING happened. So I click on Choosing New Core setup ā Roon could see my Roon Core on Mac mini but itās initializingā¦ probably forever.
Iām desperate with no idea what is the next step I should go. Could help anyone?
I have set up new Core running on Roon app instead of RoonServer app. I works, at least for now. It seems not as stable as RoonServer (experienced few crashes within first 5 minutes). Will see if itās full alternative.
There must be a bug on Server app (build 970).
Yes there is and a fix is being worked on
Good to know the problem is not on my side. Roon all-in-one app works fine.
Thanks.
I can confirm that the full Roon all-in-one download is working on my MBP as well. Thanks for the tip, @Ales_Micka!
Well, except my Playlists which have the same issue that Iāve been having for months when trying to migrate from my NAS to a MBP. 
Hi All,
Experiencing the same issue as well, brand new install of Roon Server - just rebuilt my Mac i5 2012.
Would be good to understand where the ticket is at for the fix. Iāll install the Roon all in one app in the interim.
Cheers
Carl
As with most bug fixes itās probably in testing and unlikely to be pushed for public release until the weekend is over and support is fully on shift again for weekdays.
Iām currently experiencing this and canāt seem to figure out how to get it solved. Iāve rebooted my Roon Servier Mac Mini and whether trying to run the client on my iPad or directly on the Roon Server, Iām in an endless āinitializingā status. Version 1.8 build 970.
I have no clue where to start with troubleshooting. Network is fully in tact. Not changes at all to my router. Full access to the internet.
Iām experiencing the same issue on my Mac Mini 2014 that I had been using as my RoonServer for years.
I recently got a M1 Mac Mini to replace it and forgot to back up my old server prior to installing RoonServer on the new Mac Mini.
When trying to go back to my old server to do the backup, Iām getting the same āInitializingā¦ā error.
Both Mac Minis are running Version 1.8 build 970.
The M1 Mac Mini starts just fine, but the old one is now stuck.
I tried installing the full Roon on the old mini, to no avail.
Is there a way I can access the cache/backup of the old Mini despite the startup issue?
Edit: as I was typing this, the old Mini finally showed āConnectā.
However, when I click on it, Iām getting the login page and quickly after that an error message shows up saying that the Core wasnāt connected. I canāt do anything on this Core.
Edit 2: Iām getting the same error on the new Core nowā¦
Changing from Roon Server to Roon (or vice versa) necessitates renaming of the Roon (or Roon Server folder) in the Library.
Locate the folder following this method: https://help.roonlabs.com/portal/en/kb/articles/database-location#macOS_Core
Then try this method:
Hey everyone,
We cannot thank you enough for your continued patience as we navigate this issue. Not being able to access and connect to your core is immensely frustrating and I completely understand the gravity of this bug. I also wanted to thank everyone again for providing detailed reports of the issue.
I have a good update to share: we have discovered a solution to this issue, and are on the final stretch to getting it released to you all. I canāt comment on a specific timeline, but we are without a doubt on the home stretch.
In the meantime, if youād like, you can download the Roon-all in one app which should connect normally. Let me know if you have any questions, and I will follow up soon with more updates 
Hi Benjamin, what is this all-in-one app you speak of? I donāt see mention of it on Downloads ā Roon Labsā¦
The basic Roon app, as Iāve circled in red, is also known as all in one, because it is in essence a roonserver and client in one package. However, it can also just be a client if you have another core alredy on the network, when you install it, just connect to that core and the server portion wonāt be activated on the PC.
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Thanks Rugby, makes sense. However, Benjamin said this:
I do have the Roon app on a Macbook Pro, and it canāt connect to my Roon Server running on a separate Mac Mini (probably due to this bug). Do I not understand what @benjamin was suggesting?
@Matt_Armstrong I think @benjamin means connect locally. So rather than install RoonServer on your Mini you would install the full Roon package on your mac Mini (probably the same one you installed on your MBP), and during initial setup you would choose the option thatās labeled something like āSetup this device as your RoonCoreā (sorry, donāt remember the verbiage). Another way to think about it is you would install the same Roon dmg (circled above) on both your Mini and your MBP, but on the Mini you would set it up as the Core and on the MBP you would use it to connect to the Core. Hope that helps.
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Roon Core Machine
RoonServer v1.8 (build 970) stable on macosx
macOS Catalina 10.5.7
Mac mini (Late 2012)
2.3 GHz Quad-Core Intel Core i7
4 GB 1600 MHz DDR3
Networking Gear & Setup Details
A number of Google Wifi mesh devices. The Mac Mini is plugged into one of them by Ethernet. Iām able to connect to the Mac Mini with remote desktop.
Connected Audio Devices
n/a, as I canāt connect to the core at all
Number of Tracks in Library
Maybe 2-4K tracks?
Description of Issue
I upgraded the core and updated macOS at the same time. After this I canāt connect to the core. All my Roon remotes say that the core is āinitializingā. It has been like this for a few days ā I canāt precisely remember, as I left it for a while hoping it would fix itself.
I have uploaded a āMatt Armstrong Logs.zipā to the Roon logs upload server as described here https://help.roonlabs.com/portal/en/kb/articles/logs