4.11.5 Bulk Packing Slip Error - Error Access Denied: Possible Csrf Attack

Since upgrading to 4.11.5 if I try to do a bulk packing slip print it opens the new window but then takes me to the Dashboard and gives me the ErrorAccess denied: Possible CSRF attack

I've cleared cache, logged out, restarted browser, etc to no avail.

UPDATE: It does this even if I try to print a single packing slip from the order list.