Top-right button "Devices" not working sometimes

Hello everybody!
I have no idea whether this has been posted already, but:

Sometimes, when I want to preview my app on fuse preview, the button “Devices” doesn’t work at all.
I haven’t been able to reproduce the error, but sometimes it shows half of it, and I still can’t scan the QR code.
Untitled

Short answer:

We need funds to build a new stream-lined, well documented version: https://medium.com/@mortendanielfornes/introducing-fuse-sdk-890180044c13