Hi, this has been our experience too.
Please see sidebar here: http://www.ccwhitby.co.uk/
(You will need to scroll down to see the calendar widget.)
Does anyone know if this is a known issue with the latest WP 4.5.2 update before I test for theme and plugin conflicts?
Thanks.
Chris
I too have this problem – admin area running very slowly – up to a minute to refresh. Very high CPU load on server while the page is refreshing. Deactivating the plugin restores normal functionality. I believe this occurred after upgrading to BackUpWordPress 3.5. The site is running WP 4.4.2
We are also getting this exact same conflict. We would love to use both White Label CMS and Mandrill. Has any one got any ideas? Great if this could be resolved. Thanks.