Hello. Keep up great work.
Basically I never managed once to open a qubicle (.qbcl) file by double-clicking on a file. I can only get the open dialog from within launched Qubicle and then select that file. Finder-centric approach never works.
Also after trying to open a file from Finder all the shortcut buttons to recently edited files (right next to the huge open button) become inactive. Restarting Qubicle helps to re-enable hem.
I'm using Qubicle 3 on macOS Sierra.