Seems like this is an issue related to a Timeslot that has already been solved only within the Professional Edition. If you are already subscribed to our service, you could get a patch rather fast from our Support Team, otherwise I am afraid you will have to wait until the next release.
On the other hand, another thing you could do - besides subscribing to our services or waiting for the next release - on the meantime is using the source code of the 2.1 version meanwhile and see if it works correctly.
Best regards,
Francisco