I upgraded from DEVONthink Personal 2.8.10 to DEVONthink Pro 2.8.10. When I open Pro, two databases are listed in the far left column under “Open Databases”, an inactive database from years ago I created w. DT Pro v. 1 and my current DT Personal database.
But when I select my DT Personal database in “Open Databases,” all my previous Groups and Text files are gone w. only Image and PDF files remaining. 
The Image and PDF files are now in a subfolder called “Files” of parent folder “Grouped 1.” These files also appear in Smart Folders of “All Images,” All PDFs" and “Duplicates” at the top.
When I re-open DT Personal, everything looks normal and all files are present. How can I import my DEVONthink Personal database into Pro and retain all files, as well as its organization format and appearance? Thanks. 