Signed up for this forum just to chime in on this. The previous LastPass app, before the apparent Safari extension policy change, worked decently. But this new macOS app with bundled Safari extension has degraded the experience severely. Eg. how is copying the password from quick search with cmd+C keyboard shortcut not something that is implemented at all?
But worse than that I'm experiencing similar issues as others have mentioned of a loading spinner showing up when trying to copy a password by clicking on a search result. Also, sometimes the quick search is just blank and completely non-functioning until restarting. It's just a blank window.
I'm pretty sure most of the time recently I've just had to open the full LastPass window, search up the item again, and get the password. Not having a keyboard shortcut or button to copy the password here either is also completely befuddling. Edit and delete gets buttons though…
Currently using LastPass 4.33.5, and macOS High Sierra. If it wasn't for my company using LastPass, I would seriously reconsider switching to something else.