I'm having a problem with the dimensions of the slideshow thumbnails in SPPB5.
Let me explain:
Ex: When I add a page layout I'm interested in, in the Image thumbnails section I have the height at 162 and the width at 160 (see image).
[http://www.netcreation.fr/sppb5-slideshow.jpg]
But if I want to change these dimensions, I can't go any higher than 100.
If I try to create a slideshow without using a layout, the dimensions cannot exceed 100 or be negative values like you do in your layouts.
For your information, I've tested the same problem on various J4 + SPPB5 sites.
Thanks for your help.