G3.0.4 [3097], macOS 10.13.6
If I select two files and double click on one of them to open them, Glyphs will work a short time then quits responding, requiring a force-quit. I have to open them individually. Previous builds did not have the problem.
Can you send me two of those files? It works fine for me. And can you try without plugins?
Sent to Support.