[TYPO3] Images only not rendered in frontend with text w/ images

[W van Bruggen]

Hello list,

Images that I insert with the RTE are displayed fine in both back-end
and front-end of the website. Images that I insert through the text w/
images element are shown in the back-end, but are not rendered at all
in the frontend. In the source I find the following, with no <img> tag
between the <dl> tag and no width inserted for the positioning class.

<div class="csc-textpic csc-textpic-intext-right"><div
class="csc-textpic-imagewrap"><dl class="csc-textpic-image
csc-textpic-firstcol csc-textpic-lastcol"
style="width:0px;"><dt></dt><dd
class="csc-textpic-caption"></dd></dl></div><div
class="csc-textpic-text">

I've ran all the tests in the install tool, and boot gd and
imagemagick are functioning correctly.

All other typo3 sites are not having this problem, just this one. Do
any of you have any clue where this problem might be coming from?

With kind regards,
Wietse