[TYPO3] content tables not rendered

[Robert John de Stigter]

Hi all,

I'm having big trouble with tables on my website. Al that is shown in
the code is

<!-- CONTENT ELEMENT, uid:312/table [begin] -->

<a name="312"></a>

<!-- Header: [begin] -->

<div class="csc-header csc-header-n1"><h1
class="csc-firstHeader">maandlasten lineair</h1></div>

<!-- Header: [end] -->

<!-- CONTENT ELEMENT, uid:312/table [end] -->

So the header of the content element is rendered but the table not! 

What is causing typo3 to do this?

Help,

Robert