The story:
PS 4 for some reason asked me for my password when I went to open the converted catalog and didn't accept the saved password.
Took the painful step of recreating my main database last night giving it a new name.
Opened the catalog this morning and app crashed while generating thumbnails.
Restarted the app and the catalog isn't there.
Searched internal drive and nothing found.
Found a copy on my external backup drive thanks to the nightly backup.
Disturbing to say the least.
Taking it as a sign to move on to another tool.
Shame.