I'm just assuming here, but correct me if I am wrong.
If I do not have a return TabID in the store settings, orders will be processed through Paypal/Payflow/etc.., but catlook will display "No orders found".
I'm assuming sincere there isn't a TabID, the payment processor doesn't know where to submit the order processing status data (aka call/post the order status).
Does this sound correct? Just curious. I'm debugging an install and matched it against another portal with the same configuration and the only difference was that the Return TabID value wasn't set (actually it was set to -1 and we know there is no -1 TabID).
So is my theory correct?