Ok, I'll answer my own question then ;-)
No idea what made it break between 4.4 and 4.5, but I found a way to fix it:
http://forge.typo3.org/issues/26073
Cheers,
Loek
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Hi,
I'm struggling with an issue after upgrading to TYPO3 4.5.x: an additional field
added to tt_content by the extension rzcolorbox ('Colorbox slideshow') no longer
shows up in the backend forms. In 4.4 there was no problem, I've tried a few
different 4.5 installations (it's on 4.5.2