[nevetS]

OK - interesting, but not a solution yet -
If you add the following to your carp configuration, it will output the quotes properly -

CarpConf('encodingout','UTF-8');

But - it will only work if the document type is UTF-8, otherwise you get garbled characters.

This is typically done by having a meta tag in the header as follows:

<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">

but that isn't working on my forum. Firefox is still showing the page as ISO-8859-1.

I am a bit concerned that fixing this problem might just break some other things.

There is another option in CarpConf

CarpConf('fixentities',1);

but that only seems to fix your opening quote, not your closing quote or the single quote.