I'd like to contribute to this issue, if it is okay with the OP and anyone offering advice for help!
I got an Xbox One for Christmas, and I've had my Roxio GameCap HD Pro for a year, since the previous holiday season. I've recorded plenty of Xbox 360 footage and also some PC footage as well, minor issues here and there, but all were solved, mainly thanks to your help, Jim. Now, I recently moved back up to College, and had to re-set up all of my electronics, etc. When I was at home, however, I had my Roxio hooked up to my Xbox 360, ready to record. Once I got the Xbox One, I wanted to record a bit of footage for a teaser video for my channel, so I simply moved the One console, switched out the HDMI cables from my 360 to the One in the input of the Roxio, and opened the software, boom, bang, good to go.
Since I've moved up here to school, I'm currently having issues with the capture software. I'll post a screenshot below, of the capture software. Jim, I've got a bookmarked troubleshoot topic that I used last year that was extremely helpful. So I referred back to that, and went through all of those steps, and I've still got nothing. I then decided I'd try a different input, to be sure it wasn't just some Xbox One settings issue. I plugged my HDMI for my PC Monitor in the way I've always done, and just like I thought, still no signal on the caputer software, in red text. So, I'm not quite sure why, all of the sudden, it's not working, when it was working finer than frog hair just a week ago!
I apologize for the long post, but I wanted to be sure to be thorough, and hopefully condense the post count, if possible!
Here's the screenshot of my capture program, in the form of a Gyazo link:
Thanks for any help for the both of us, I'm hoping this is the same sort of issue the OP is having!
*EDIT* Another symptom of this seems to be, I can't even open the options dialog from the Tools in the menu bar of the capture software. It says the program has stopped working and forces me to close. Just a quick add on there.