Sorry for the late reply and all the anticipation. I'm in a different timezone
Anyways my poller is the one that I copied here of Thwack so I assumed it was the same as the one you are using. My OID is the same as yours.
When I do the test on the OID, not all my Riverbeds work. Some say "The OID is not supported" & "Admission Control". The rest say "Healthy".
On my Riverbed page I have all the pollers listed. Here are some examples where you can see the different responses.
And this is the text I get in my email (obviously not formatted correctly and I've changed the device name).
"
This message should be customized to provide more information about the specific alert you created. You can use variables to provide detailed information in your alerts.
nxxxxxxx2 (XXX)
Healthy
"
My email settings and trigger settings are as I posted in my previous post above.
So it does look like the OID is not supported on all Riverbeds but I can't see why it won't work for you especially seeing the Test button works in Universal Device Poller.
I hope that helps.