I am running Logos 36.1.6 with a Logos Pro subscription on Windows 11. The Add Versions drop-down in the Bible Search window is blank when I click on it. There are no options to select. There's just a find box but the find box doesn't find any versions when you type something in.

I think this might be an issue with Logos Pro. I already had v36.1 prior to subscribing and I don't remember having this problem. I had recently used the drop-down and was able to select a version fine.
EDIT: This is not just a Logos Pro issue. I was able to duplicate the issue in my test account. It seems to be the search itself. Since it didn't return results in my top bible, I went to Fuzzy bible search, which gives results. But I still should be able to select another version to see the verses in a comparison translation. This still seems like a bug.