When I access the link "Reload Configuration from Disk" in the "Manage Jenkins" area. I get a popup asking for confirmation since the upgrade to Jenkins 1.512 (previous was 1.478). When I click ok, I get the following error message:

HTTP Status 403 - No valid crumb was included in the request

type Status report

message No valid crumb was included in the request

description Access to the specified resource (No valid crumb was included in the request) has been forbidden.
JBoss Web/7.0.13.Final