We are sending an HDMI signal through an HDMI extender to a switch and then out to two TVs. It was working fine until we purchased the Basic HD version. Now, instead of showing the fullscreen window, it shows the entire PC screen on the two TVs. However, if I connect a single TV directly to the HDMI output, I get the correct fullscreen. Could using the Basic HD version rather than the Demo be the culprit? Do I need to get a higher version? Anything else I should check?

Thanks for the response. I figured it out. Just for your info my system is set up like this: PC -> HDMI out->HDMI Transmitter Extender/converter->CAT6 Ethernet->Switch->HDMI Reciever->HDMI->TV. I have two outputs to TVs. It works very well. I racked my brain last night thinking what has changed since it last worked properly. Two things, I purchased the Basic HD license and there was a Windows 10 update which I hadn't thought about. I checked it this morning and the Windows update had changed my displays from "Extended" to "Duplicate". I changed it back and everything works. Thanks again!