Yesterday (19. Nov) we released the new version 1.2. During the upload of the new version some of your currently running tasks might not have been saved to our server. We found the reason why there was no error message for you and now it’s fixed.
From now on, if whatever reason is preventing the Timer to save your task, it will let you know.
The Toggl Team is very sorry for the inconveniences we might have caused you.