silvine on "WordPress editorial calendar issue"

WordPress editorial calendar says it can't connect to my blog. Does anyone else have this issue?

Here is the JS error (login details edited out):

Resetting to date from the edcal_Date cookie: Mon Mar 24 2014 00:00:00 GMT+0000 (GMT) edit.php:1125
Resource interpreted as Font but transferred with MIME type application/font-woff: "data:application/font-woff;charset=utf-8;base64,d09GRgABAAAAAF10ABEAAAAAk0Q…H/hbABjQBLsAhQWLEBAY5ZsUYGK1ghsBBZS7AUUlghsIBZHbAGK1xYWbAUKwAAAAFTJuE+AAA=". edit.php:1281
3
Calling LP_setval from A onloadwff.js:78
removePostItem(00000000, post-3517) edit.php:1125
removePostItem(00000000, post-4216) edit.php:1125
removePostItem(00000000, post-3360) edit.php:1125
GET http://---/wp-admin/admin-ajax.php?_wpnonce=9184d4f667&action=edcal_posts&from=2014-03-10&to=2014-05-12 500 (Internal Server Error) load-scripts.php:5
There was an error contacting your blog. edit.php:1125