Trouble getting data with IB Gateway

I'm troubleshooting an issue connecting to Interactive Brokers. I can connect from Zorro to IB using TWS and while connected, Zorro S is able to fetch recent data for the SPY asset. However, if I attempt to connect using IB Gateway (Build 978.1k), the following is printed in the Zorro output area:


Any idea what I could be doing wrong in my IB Gateway setup that would preclude Zorro from being able to fetch data for an asset for which data is available via TWS?

I noticed that there is a newer version of IB Gateway (978.2d). I installed that version and now I can connect from Zorro S using IB Gateway.