Hello!
I try to make a hierarchical custom column In Calibre 1.13.0. I think I have followed instructions given in "http://manual.calibre-ebook.com/sub_groups.html".
1) No problem to create custom column.
2) After restarting Calibre, my column is already known as hierarchical.
3) Entering value for a given book.
4) Final column appearance.
I obtain a column displaying "Computer.Programming.Languages" as such: no tree! I did a complete Calibre installation from scratch (even my libraries were deleted from my hard disc): same result!
As I see on forum, most users have no problem...
Please help me
I use a Mac intel on OS 10.7.8