[Zope] Structured text <img> tag not working in Zope 2.61

I have a site with lots of structured text. There is a lot of <img src='/some/image'> tags in the texts. But after upgrading from Zope 2.51 to Zope 2.61, I get broken images all over the place. <img src='images/kreativ.jpg' align='left'> This tag is turned into: <img src="%3Ccode">images/kreativ.jpg align='left'> While: <img src="images/kreativ.jpg" align="left"> is rendered correctly. It used to work. Does anybody know why it doesn't? What is the easiest way to get around this. Can it be the new inline image tag that plays strangely? regards Max M