I ran into recurring bug with the opacity information, most noticeable when reopening a file.
I’m using the color palette method, and whenever I want to adjust the opacity of a reopened file palette color, all opacity values jump to 100%. When I open the file and don’t make any changes, the opacity remains intact. This issue also happens very rarely when not reopening a file, but I haven’t been able to reproduce when this happens.
Running the latest cutting edge version, I can send an example file if needed.
I have also run into an issue with the Master Color method, as sometimes Glyphs crashes when trying to open the color picker, this seems to happen almost every second color you want to adjust.