Missing Session Drummer

Hi.
I use Sonar Platinum at work and at home. If i create a project at either location and insert an instance of Session Drummer, save it and then start working on the same project at the other location, when I load the project it states......
 
'the following plug-ins are referred to by this project, but could not be found.....etc etc.
 
It then refers to SessionDrummer, which is installed at both locations. At that point, I have to delete the instance and then insert a new instance for it to work, and then the same thing happens again at the other location.
 
Im wondering is it perhaps because the plug-in is named differently on both machines?
 
Id truely appreciate any ideas anyone might have.
 
Regards
 
Lee