well I can give you tweaks but its all going to come back to what I have repeatedly said a few times here the real issue is the server setup. I gave examples above showing the links work everywhere else. In fact the only place this issue can be found is on your server. I would prefer to actually find the server issue and find out what server setting has to be tweaked.
You can try in bulkupload.php changing this
Code:
Content visible to verified customers only.
to this
Code:
Content visible to verified customers only.
The error your reporting is a server error not php code related. your server seems to have issues with forwards.