The catalog process is still running from last night so waiting for it to finish before I try anything else to try again.
The way this happened for me was opened a fresh install of PM+. The only two tabs that were open on the left side were "Navigator" and "Favorites". I went into Navigator and found a folder with lots of photos, then right clicked and added to favorites. Then went into Favorites tab and picked a folder which opened a contact sheet. I then right clicked on a folder and selected "Include when scanning to Catalog" which brought up the Scan to Catalog window. I left the Default Catalog as the one to Add, then pressed Start and the Scan Status box started showing filenames. This eventually stopped showing new files so I clicked on Close.
I then clicked on "View" then "Organizer". Being my first time using this, I didn't know how long it would take to complete the calatog process or when you could search so I tried typing in a keyword that I use in tags for the EXIF data. Nothing happened. The contact sheet that was open in the previous step, I double clicked on an image and the Preview window opened, which already had a Tasks section included (see screen shot above) which showed me Catalog was working. I then went back to the main PM+ window and clicked on "View" and then "Tasks" which opened a section below the Organizer area but it is completely blank and not showing anything (see above screen shot).
Once everything is done, I will see if I can try again, but that is the process I took to get there.