And this was the solution posted in the Joomla forums: (Cedit goes to Kjell Hhlen.)
I wrote a fix. My version is Joomla 1.0.13 but I suppose it will not be very different for later versions.
You sould replace two files by the ones in the attachment:
(this solves the Reference instead of value-problem)
(to make the contact form work again)
If you rather add the changes by hand:
The changes to vcard.class.php are minor, look for:
In Function.php I added a this line twice:
$arguments = $this->fixCalls($arguments);
The new function (fixCalls) is added at the end of the file.
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