Hi, my site: tenniskafe.com have the same problem as many of users write here before me.

When I click on comment button is displayed message box with text: "Request failed" - this is on firefox.
On IE, I receive following message:
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Message from webpage
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Invalid xml declaration.

Contact the support ! and send the following informations:
error is line 3 position 3 >>ml version="1.0" standalone="yes"?>11107881![CDATA[

Tenniskafe is live site with very big number of daily users and this errors are very unpleasant and aversive!

Can you help me to solve this problem?