Greeks -
I have the same set up as you. JR is an introducing broker. Nothing really goes through them. They get paid a commission by PFG.
Account money is held by PFG. Data feed comes from PFG (from exchange feeds). Transactions go through PFG to exchanges.
TradeMaven is simply the platform which takes in the datafeed from PFG (to show DOM and charts) and sends out order info that you input into it to PFG, which then forwards the orders (buy, sell, stop, limit, market etc.) to exchange for action to be recorded.
Any datafeed problems occurs at PFG on their servers or on PFG's connection to the exchange data. It has nothing to do with TradeMaven or JR.
I had datafeed problems when I was with Transact, while using the TradeMaven platform.