I am tied up with my day job at the moment - you’ll be best to give it a shot of your own if you’re in a hurry.
Glad it’s sorted. My guess is that either something about the file changed (worksharing?) or something about the Dynamo environment changed (package installation?).
no, nothing changed, and it was not only me, all my mates in the organisation had the same issue with diffrent projects 
@Claudio.Best can you grab your log files from yesterday and one from today? I’d like to see if there is any warnings which were present but no longer are. They can be found in %appdata%/Dynamo/Dynamo Revit/2.19/logs.
@Mark.Ackerley does the issue persist for you?
sent it to you privately
The difference between the first graph and the second is that you changed the type of schedule, from regular to key schedule. I have the same issue and is not working but in key schedule type.
i did not change the type of schedule…