Steven Zahm@ Dwight
re: If an entry has one category, all works perfectly. But if an entry has multiple categories (separated by a comma), Import CSV does not check to see if those categories already exist; they are added each time, creating duplicates. I had over 1000 duplicates, which were easy to delete by clicking the first, shift-clicking the last, then bulk delete, no problem.
Can I get a copy of the CSV that you imported that made duplicates? The only time I’ve ever encountered this before is when the preexisting category, the one that was duplicated, had a weird nearly invisible UTF8 accent (or something). After I corrected the name, there were no more duplicates created on import. This was just once and seemed to be such an edge case I have not investigated it further.
re: Missing Categories in the “Select Category” select box. Nested categories are only shown for the first and second levels. Categories 3 or more deep are not shown.
The default is to display all categories regardless of the hierarchy depth. What is the exact shortcode you are using? Was the template altered in any way?