A week or two ago, with no known system changes, BTT simply stopped working on both my Magic Mouse, and my Track Pad. No OS upgrades, no other changes. This REALLY impacts my workflow as an audiobook producer, as I've built my workflow on the back of my ability to do one-touch keyboard macros without having to take my hand off the mouse or pad.
Weird, in that case open the Preferences window and go to Help => Export Diagnostic Debug Information and send the result to andreas@folivora.ai, then I'll have a look!