I have the same issue with a lot of multi-output plugs.
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Logic 10.5 broke A4i plugin here.
Not only that but it also breaks audio out using OB ie if I instantiate a4 plugin in logic (and get the “not loaded contact vendor” warning with an orange exclamation mark in the plugin slot) the audio out at the A4 stops until I reload it in Logic Audio preferences.
Edit: I should point out this occurs for stereo plugin as well.
The same happens if I’m not using A4 plugin in logic but rather load the standalone A4 app, audio through OB output is cut for BOTH A4 standalone and Logic.
Ahh well…I had it working for a day!
Seems to work fine in Reason and Reaper…
I have the same issue, the only plugin that is currently working for me is the Digitakt.
I’ve just done a fresh install of Catalina as well as all my other software and confirm that OB does not work with Analog Rytm. Brings up a “failed to upload Audio Unit” message. So, it’s not because of upgrading as this is a fresh install.
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Logic 10.5 also broke multi-output functionality in Expert Sleepers plugins. So it’s not just Overbridge:
https://www.muffwiggler.com/forum/viewtopic.php?f=35&t=231657#p3266326
Glad I held off on updating!
I have the same multi-out options with the Digitone.
Hi, for anyone with this problem: I found a quick fix. In your applications folder there’s a file called Logic Pro X.backup. That’s actually Logic Pro X 10.4.3. Run it, open the plugin manager, select Overbridge and run Reset & Rescan selection. Check if Overbridge runs in 10.4.3. When you open 10.5 after this Overbridge runs again with AR MKII, might work for others as well.
Logic 10.5, Mojave10.14.6
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Nice one @Mokosound, I’m away from the A4 for the next couple of weeks so can’t try that, but appreciate the tip.
Has anyone figured this out?
I get the same weird selection of outs as @zorgillion in Logic with my Digitakt… but only the Stereo out works. When I rescan in Plug-In Manager, I get:
WARNING: Source AU supports multi-channel output but does not provide a channel layout
Unfortunately I’m not finding a Logic application back-up file, per @Mokosound’s quick fix…
Pete
Digitakt 1.11, Overbridge 2.0, Catalina 10.15.2, Logic Pro X 10.5
Sounds like it’s a known bug, according to posts on this forum:
Do you use Time machine? If so maybe you can retrieve the previous version from there, just be sure to change the name to before you put it in the applications folder
good thought…but unfortunately I do not…
same for me on a fresh install of logic 10.5 (no update). Lots of weird outputs and only stereo option working. No problems in i.e. Studio One
Logic 10.5 broke multi output audio on a number of plugins including waves and izotope. General rule that bears repeating every 4 months. Don’t update your shit if you don’t have to 
Thanks for all the replies everyone. I can confirm that this is a known issue with the new update of Logic. This was elektron’s response to my ticket:
“Apple has confirmed that this is an issue in the latest version of Logic. Hopefully this will be fixed in a coming update, but we have not received any indication on when this will be done.”
I’ve sent a bug report to Apple as well.
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same problem here.
Digitakt and Digitone AU won’t load.
anyone hear about an ETA when this might be addressed. this ones kind of a bummer 
feels like a big ball has been dropped.
Works fine for me. No issues at all with Overbridge.
Running Analog Rytm MK1 with seperate outputs (USB).
I have the same number of outputs as before I updated Logic to 10.5.
I can load all the Elektron plugins.
MacPro 2009 running Mojave.
Try loading the AU 
You can run the separate outs from USB: Audio/MIDI when you’ve routed them to their separate outs just fine.
I actually haven’t tried OB outs. (I think ) I’ll check in a bit.
Multi-outputs working fine for me also (for A4, Digitone, Digitakt). It’s strange that it’s affecting some users and not others. I hope that Apple issue a fix soon.
I have and it works perfect.