After updating to 7.5.7 any RSS Feed generated by the forum is broken now...

All you get is when you browse to it:

XML Parsing Error: XML or text declaration not at start of entity
Location: http://www.aus-city.com/ubbthreads/cache/rss40.xml
Line Number 2, Column 1:<?xml version="1.0" encoding="ISO-8859-1" ?>
^

This is the file when you actually edit it (start)

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!-- RSS generation done by UBB.threads(tm) on Thu, 13 Dec 2012 19:30:01 GMT -->
<rss version="2.0">

Problem is besides its broken, feedburner is now no longer spidering out the updates on the forums frown