Had an issue on one job with a Yamaha AVR and I believe a AV Pro Edge extender.  Changing the Roku to a different HDMI port on the AVR fixed the issue and its been fine for the past year.  Due to time constraints on the install day, I didn't have much time to dive in and figure out why it didn't work not he initial HDMI Port.  Once I had a picture and everything was working I had to leave it be, and its been fine since.