Most of the time (but not always) when I am in a video call, the video has two sorts of overlay images, like in the examples below (cropped from original whole program window).
One overlay is a green grid, and another consists of two off-color shadows of the original video, offset vertically. Sometimes this effect happens to my own video, and sometimes to what I receive. Never both at once, and sometimes on neither.
me: 
other end: 
I use Ubuntu 14.04 LTS with a Logitech C905 webcam (2MP, autofocus, etc.) and Skype 4.3.0.37, the newest version for Linux. My counterpart in this screenshot uses the same OS, same Skype version, same webcam - but he doesn't see this effect at all.
lsusb seems to detect the webcam properly. I don't see anything wrong in the Skype settings, and the tiny video preview is okay:
I have recently reinstalled Ubuntu 14.04 LTS from scratch but this issue remains even after that. I've tried to test with Google Hangouts, and that seems okay. I've tried cheese too and that also worked. But the answer can't be "use a different chat app" because the people I Skype with only have Skype, and they're mostly grandpa generation - I don't want to burden them with my video problem.
--> What's causing this, and how can I fix this?
I wouldn't be surprised if the answer is "you can't, Skype for Linux is deprecated and broken" but I hope there might be a chance.
