Sorry, just realized I never said what the problem was, just that there was one :) (was rushing out when I wrote it)
The problem is the Calender doesn't scroll when the easy slider plugin is activated.
The JS loading icon appears. And the calendar appears with it's last known position, but it doesn't scroll. Highlighting a post on a date brings up <edit, view etc>, but trying to move up and down the calendar is not possible.
I have a lot of plugins running on at the moment, so it might be a combination of more than just these two. But when I've not have any other problems with Editorial Calendar other than when Easing Slider is activated.
Happy to help out if I can, as I'd like to implement both plugins. Or work out what the problem is.
I'll try uploading easing slider to another site I have with Editorial Calender to see if the same problem occurs there too, and will feedback.