I've logged a support call with TCL but they're just pretending not to know anything about the issue and keep sending me messages like:
"Hello Sam, can you advise if http://www.php.net/docs.php appears as an attachment? If you have any further queries"
... without actually listening to me saying its the transparent proxy and that the error is at random.
Note: This was supposed to be in reply to another topic
[Moderator edit (MF): will leave it as a new topic]