Hi Robert,
> typolink.additionalParams.dataWrap = $category={GPvar:category}
"GPvar" was deprecated many versions ago and finally removed recently
(in 4.6 or 4.7). Try using "gp" instead.
And I guess the $ sign is just a typo (should be &, of course).
HTH
--
Francois Suter
Cobweb Development Sarl - http://www.cobweb.ch