Matrix / Wygwam PHP errors

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Hi,

I'm trying to use Wygwam with matrix (latest versions, with latest EE2) and am getting PHP errors.

Its fine if i use Wygwam seperately, or Matrix with anything else, but Wygwam and matrix together is playing up.

There's 2 errors:
Undefined property: Wygwam_ft::$row

and

Message: Cannot modify header information - headers already sent by (output started at /home/east47st/public_html/system/codeigniter/system/core/Exceptions.php:171)

Filename: core/Common.php

This is my template (xml ):

<?xml version="1.0" encoding="UTF-8"?>

AUTUMN 2010
SPRING 2011

{exp:channel:entries channel="autumnspring"}
{autumn_dates}

<![CDATA[<h1>{autumn_venue}</h1><p>{autumn_details}</p>]]>

{/autumn_dates}
{spring_dates}

<![CDATA[<h1>{spring_venue}</h1><p>{spring_details}</p>]]>

{/spring_dates}
{/exp:channel:entries}

Many thanks!