I'm helping out on an issue with CRM 2015 where the users have created a simple FetchXML with a link-entity for a table join.
When the user exports the view without filtering, it works fine. When they filter using a "contains" on a text string, exporting fails with "Refused to set unsafe header content-length". However, if they filter the same field with an exact match "eq" then the export works. Using the admin console in the view and entering the same contains condition WILL work for an export - it just doesn't work on the actual main view/report itself.
We've tested on IE and Chrome. Chrome reports the error mentioned.