No error messages when data not saved due internet problems

If there are problems with internet connection and scheduler cannot save an event into database (per ajax), no message will be displayed to the user. The user will think that everything is OK, however the data is lost. How can I detect such problems and show messages to users?

This is a known issue.

The next update will contain a fix - dataprocessor will correctly finish the updating process in case of server side error and will provide onError event for custom reactions.