This can often be caused by something called 'mod_security'
installed on your server. This can stop TrackPoint from
being hit because of the URL. Basically your website gives TrackPoint
this URL:
http://www.example.com/t.php?u=2&r=&l=http%3A%2F%2Fwww.domain.com%2F
To resolve this try placing the following in a file called '.htaccess' in the marketing folder:
<IfModule mod_security.c>
# Turn off mod_security filtering.
SecFilterEngine Off
# The below probably isn't needed, but better safe than sorry.
SecFilterScanPOST Off
</IfModule>
If that doesn't work you'll have to ask your host to disable
mod_security for that particular host otherwise TrackPoint won't be
able to work.

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