Events without start time are invaild icalendar resources. There is https://icalendar.org/validator.html - you can try to find out whats wrong with it - hope it helps!
Event Change Notifications
First of all I’d like to say your app is brilliant! Thank you so much for creating it.
I was just wondering if there was a way you could make ICSdroid generate notifications if an event has changed i.e.:
-A notification for a new event
-A notification for an event being deleted/cancelled
-A notification for a change to an event
I know Exchange can do this with push notifications. Google Calendar can also do this but it can take days to refresh. It would be brilliant if you could add this to ICSdroid it would make it perfect.
Alternatively, if anyone knows of any other solution for this please let me know,
I would like to see this feature being added as well. Have there been any developments on this request?