Problem with subrpt links in crystal reports 8.5 (cr 9 and 2008 installed)

I am trying to add a subreport to an existing CR 8.5 report. I currently have Cr 8.5, cr 9 and cr 2008 on my pc (xp). The subrpt is pointing to a sql 2005 stored procedure that has a parameter (@vvcrCono). When I try to set up the link, the parameter is not listed in the of available parameters to link to. I select a field from the available fields on the main report, hit the > to move it over as a field to link to, and the dropdown that contains the list of parms to link to on the subreport will change to ?pm-(fieldname). I do not see the parm list from the subreport. I am unable to get the link defined. This occurs even when trying to edit an existing subreport.

Is there a problem with running these crystal report versions on the same machine? Or am I just missing something? It has been a while since I've used cr 8.5.