Groove Agent 2 won't run on a MBP OSX 10.6.x

I own a GA2 license and would like to run it with my Presonus Studio One Software. I installed the GA from the original DVD, and after updating the elicenser everything is done. GA wil run as a standalone version.

once I want to run it from my host (Studio One) it won’t be seen as a plugin … both the AU and the Vsti are not there.

Same problem with my Cubase LE 4

The Hypersonic2 on the same system works nice and smooth.

Any hints?

TIA for your support

system: MacBook Pro 17, I7 Qaud 2,2 Ghz, 8 Gig, 500 gb HDD, OSX 10.6.8