Justin, my TV is a Samsung DLP 750. I find when turning the 1800 on plus TV and my Denon receiver the TV does not pick up the signal until I disconnect power and connect it again. Just started with this new firmware. With old firmware would not pick up 1080 p with this Tv but that has now been fixed with the new firmware.
Try powering up your 1800e last. First power up the receiver,....select the correct input,....then turn on the TV and select the correct input. then power up the 1800e. what you may be experiencing is "HDMI hand shake" protocol,....every device handles HDMI a bit differently and sometimes the solution is as simple as just changing the power up order of your devices. Worth a try anyway.
Thanks I will try that.