Dimension pro no sound

Hi,

I've got a strange problem with the dimension pro(1.10) I've got with the upgrade of my Sonar 7 prod version to 8.
(Because i'm running it on a Vista 64x setup i've got the 'not correctly installed'-bladibla...So I'm in administrator mode.)
When I insert the Synth, and discarded the 'not correctly' bladibla messages, everything looks fine. That is; good GUI response: Banks are loaded, etc. But there is no sound.
When using the Dimension LE there's no problem, even when I'm relaying the midi from the softsynth track to the LE.
So to be short: My user's got infinite privileges, There is no soundcard problem(All other stuff is perfectly audible), MIDI is coming through and I've got my Sonar properly set up.
Can any body help me out? Thanks.

Dave