By the way, I can confirm the problem with opening files/folders using either drag/drop, the command-line, or the browse with PM Finder service. None of these open a contact sheet with the requested elements. It only works once you already have had PM open with a contact sheet.
Interesting observation: PM actually HAS opened the item(s), but the window in which it has done so is hidden. If you perform a File|New Contact Sheet Tab, the window with the new tab AND the tab with the requested item is shown!
P.S. @Kirk, the download page at the camerabits website mentions the build as beta 3029, this is the PM Plus beta build (which you can't download from there), the build number should be 3023, of course