>but it only remembers the internal (folder locations)
I know but when I open my 6.17 Portable it uses my C:\Data\Calibre Portable\Calibre Library without my having to point it away from the internal library, that didn't happen before I installed 6.17. Every time I opened 6 before 6.17 I had to point it to my Calibre 5 library where all of my books are. I've started 6.17 5 or 6 times today and never had to point it to the real location of my library. Also if I open choose your own library it shows the library open is C:\Data\Calibre Portable\Calibre Library that's my Calibre 5 Portable Folder
I have Calibre 6 in C:\Data\Calibre 6\Calibre Portable
I have Calibre 5 in C:\Data\Calibre Portable
I'm not complaining I actually like this behavior but I just wanted to point it out.