Unsupported video signal error

I have utilized a wireless video transmitter to give me the flexibilty of placing my TV anywere in the room and not necessarly right next to the FIOS TV box.  However, after an Aug 18, 2017 firmware update, my wireless video transmitter, which is connected to the TV box via an HDMI cable, can no longer read the video signal coming from the Cisco CHS 435 DVR box.  I am receiving an "unsupported video signal" error.  This is only an issue with my DVR box but not my non-DVR HD boxes.  Why is this happening?  Can anything be done to fix it or overcome it? 

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