Skype as software has a lot of issues. Before they were bought by Microsoft the software worked quite well; on my Mac I'm still running an ancient version. Why ? - it got replaced by a version that takes up half your screen, I think they were trying to make a single version for desktop and iPad. After a public outcry they reduced the size somewhat. The latest version has about 3 extra options about the amount of data you will be sharing with Microsoft/associate companies. What ? I want a phone service, I don't want my personal info datamined. OK, they give you the option to disable this but it doesn't fill me with confidence.
If you want to use Windows 8 Metro version you must "link" to a Microsoft account and change your login to use that method. It's the first thing that it does, but the UI is very subtle about it. IIRC, it even wants to change your desktop login settings. Phone software should not be changing system settings. Also the latest version removes the option to hide the fact that you have a webcam. With Skype you absolutely must read all the fine print and dialogues.