Just a guess but turn off the referrer check
Control Panel » Primary Settings [-] Advanced Options
Disable HTTP Referer Check? select it to disable it.

It is going away anyway.
It was for v8 and it is for v7.6.

I turned mine off around v7.2.
It is not needed anymore and causes problems with redirects.

Blue Man Group
There is no such thing as stupid questions. Just stupid answers