Hi, i hope i'm not resurecting the post. I have the exact same issue. Tryed everything and i got the same error mentioned by HighTower.
This is my entry.
My settings is as recommended. Tryed running as administrator and it still a no go.
Something to put in the miuxture (but should not matter that much)
I'm running on Win8 and the Opus folder is inside FSX folder. Other than that everything else is standard.
Did HighTower find a solution?
I just researching before trying to contact opus product support.
Btw, i did reinstall simconnect, gave the full opus folver permission to everyone have full control, no luck. Something should be happening with the downloaded gridb Data that is it not able to process it. i Can zip it and send it for support to analyze the data.