Appointments+ Can't Have More than 1 Service Provider

Hi there!

My problem is in the Appointments plugin -- when adding a new service provider, I'm not able to schedule any new appointments once the new instructor has been added, nothing is shown as available on the calendar -- the same times should be available, just w/ an additional service provider to choose from (At least, that's what I wanted to do!).

I have the original 1st service provider w/ 6 services selected, and under this new service provider, I only had 3 services checked. Once added, the entire calendar goes red, I'm not able to schedule anything. Once the 2nd service provider is removed (services unchecked) plugin works fine. Please advise!