Specifically, when selecting ‘use full width in binder’ under ‘View > Use Label Colour In…’, exiting and re-entering the program seems to uncheck this box. Has happened consistently every time I’ve attempted it. Doesn’t seem to happen with other label colour options; the colours still show up in the binder and other selected places, just not full-width.
The usual disclaimer applies: it’s entirely possible this isn’t a bug and is just me being blind to something obvious, but I’m optimistic enough to think it’s a problem with the program and not me.