Question: Any machine that is part of our corporate network doesn’t want to display the video in browser window. I’ve talked to our IT guys about it and they are puzzled too. I have noticed that on other machines that ‘allow’ and ‘allow always’ have different effects on the working of the preview, and sometimes the browser needs to be re-started.
Answer: It seems like there is potentially a policy enabled to disable plugins at your corporate environment? It sounds like you had the right team on the job though to determine if that is an issue. I'll also assume all the PCs are fully licensed; I only bring it up as we had someone with similar issues and it turned out that their Research Lab was using unlicensed copies of Windows and as a result it disabled something that prevented them from accessing the camera feeds; that was quite something to track down.