Organize>Remove not working for a resource on Current or Production

Go to http://current.dev.curriki.org/xwiki/bin/view/Coll_Group_ECOCharterSchoolCommunity/Science_0 and click "Organize."

Highlight the folder "Trimester 3 - Grade 2 Science" and then click Remove and Next. Click to confirm removal.

Get "There was a problem accessing the server."

I am working as both a member of this group and a Curriki Admin.

Note (as per the Attribution section of the RVE title area) that the folder we are failing to remove in the example above was not created as part of this group, but was added into this group collection.

To test that it wasn't solely for that case, then, I also tried this with http://current.dev.curriki.org/xwiki/bin/view/Coll_Group_ECOCharterSchoolCommunity/Mathematics_0?bc=;Coll_Group_ECOCharterSchoolCommunity.SecondGradeCurriculum. Here the folder I attempted to remove (Trimester 3 - Grade 2 Mathematics) WAS created as a group resource and I still had the failure on attempting Remove.