UR12 working and then not working with OSX Catalina

Hi all,
I apologize if this has been covered — I’ve searched the forum and I don’t think it has, though there are many related threads…

I’ve got a UR12 and a UR44, running on a recently purchased new Mac with OSX Catalina. First I installed the UR12 and it worked perfectly (with Logic). Then I installed the UR44 and it worked perfectly too — BUT, when I try to go back and use the UR12, it now no longer works.

What’s extra strange is that my computer will recognize the UR12 as long as Logic isn’t running, but then as soon as I open Logic, it disappears and isn’t recognized.

Any advice on this?

Thanks so much you guys!