Hi @TomGP
For issue #2, I set Stop After to 2 (See screenshot below). This is found in the slider settings.
For issue #3 I removed the interaction on the on the Hero section. It seemed to be glitching out the slider.
Unfortunately I was unable to resolve issue #1. Have you tried publishing it and checking to see if the grey blank screen still remains? You could also delete the entire slider section and try again from scratch.
I hope that helps and best of luck!