At the moment the icon switches from black+grey to black+pink when a timer is running.
To me, the old colours were more obvious, I think I’d prefer grey to red, and maybe make the black slightly less black.
It is, I think, useful to make it as noticeable as possible that a timer is running when you’re switching applications, to avoid leaving it running by mistake, or to remind you that you should be timing something.
(Overall I’m impressed with all the work that’s gone into Toggl Track lately.)
Thanks,
William