I have no idea how to fix this.
Realm Studio notified me of an update last night. I didn't think anything of it and updated. Since then I can not open any Realm Files inside of Realm Studio.
Realm file is currently open in another process which cannot share access with this process. All processes sharing a single file must be the same architecture.
I thought it was an issue with Realm also needing to be updated. So I updated RealmSwift from 4.4.0 to 4.4.1. That didn't work.
I found this and gave it a try: (It didn't work) Realm browser is not opening because of another process
So I deleted the entire Core Simulator Folder and reinstalled it. That also didn't work.
I'm out of ideas on how to fix this.
Note: Realm still seems to work in the simulator. I just can't open the file into Realm Studio.