Ok, finally works!
I completely reinstalled Atom, removed every preference, the .atom folder, etc.
But I don’t think that actually helped.
I then, instead of installing the packages via command line, dragged them into ./atom/dev/packages/
(i cloned the 2 packages that Pier posted, the drag and dropped these)
Restarted and now everything works like a charm.
Thanks for the help guys.