This looks like corrupt settings that frequently happens when installing firmware dated March 2014 or later. The main manifestation is that the output is stuck on 576i (see
http://oztoppy.wikidot.com/output-stuck-576i). The first thing I would try is to reset service list, power down the Toppy and when it powers up do a new service scan. If you did not do a new service scan after the firmware installation, you may need to repeat this process.
I reported this problem to Topfield Australia in October 2014 but it still has not been sorted.
Hope this helps
Ian
PS Dave, I have been unable to track down the 2015 firmware. I spoke to Topfield Australia Technical Support a day or two back and they knew nothing of this firmware. My 2400s give a Network Error message when I try internet update (at least they did a day or so back); I do not have internet firmware update issues with other Toppys.