Just grabbed the latest version since I upgraded this machine to Windows 10 and adding an second GPU.
When launching, it gets stuck looking like this:
Works fine if I switch over to my NVIDIA GTX 960.
Thank you for reporting. I have verified the issue with an AMD GPU. A fix is on the way.
PicoPixel 0.6.12 has been release with a fix for this issue. Give it a try and let me know if the issue is still happening your system.