Hey Karl!
First of all thanks for the great work. =)
Now to my Problem.
In 0.14 i've created a folder named cities as a categorie.
I've set the Title and Menu Label to Städte & Architektur and it showed up correctly as a categorie within the list menu.
Since 0.15 the character & (In Title & Menu Label) causes an issue in the list menu and the folder doesn't show up as a categorie.
So for now i've changed it to the german word und and it shows up as a categorie again.
But that's only a workaround for me until the Problem is solved.
The Title and Menu Label of the Subfolders in this categorie also contains the & character and they causes no issues.
Please take a look at it.