USB - Removed from startup-sequence, user-startup.
TCP/IP - Using Miami, so only loads when I use the Miami GUI.
If I switch Workbench to an AGA mode WHDLoad works fine, so it has to be Picasso96.
I've tried older/newer versions of Picasso96 and WHDLoad, still get the blank/black screen.
Other AGA games/demos that don't use WHDLoad work fine. Other RTG games work fine.
Also my WHDLoad I've registered so it's a legit key.
So my workaround is to switch Workbench to AGA and then run WHDLoad.
Annoying.