I am having problem with the locking of HDMI signals. Signals are detected but Signal Status is stuck in "Processing". The most likely cause is that both Horizontal and Vertical Resolutions are off by 1 or 2. For example, an images of 1280x800 may be detected as 1282x801. I have tried different resolutions (1280x800, 1024x768, and 912x1140), different HDMI cables all with ethernet, different signal sources (Windows PC and Raspberry Pi), and different firmware versions (4.4 and 2.0). The problem stayed the same. An interesting observation is that correct resolution was shown during rebooting of Raspberry Pi, and the Signal Status changed for a short while to "Detected". However the problem returned as soon as the computer finished rebooting.