@DreamPunk, I made a minor change to avoid the notification error in the setup screen (just grab the latest version at github, v1.9.2, save & publish)
About all current ST scheduling issues , refer to this thread:
This is not unique to this smartapp, and we’ve been told that ST will have a fix for it soon.
P.S. In the meantime, you need to redo the steps desccribed above, and do some monitoring from time to time to ensure that your smartapp is still scheduled.
Regards.