Your first question sounds ok (if I've interpreted it correctly).
Entering through "videos" takes me to my files mode/views and therefore does not display the Information available or stored in the library mode "movies".
So unless I have mis-interpreted your question, this sounds like perfectly normal behaviour.
For your second questions, it could be a few things.
1: Do you have posters available for tv shows?
2: If yes... Then they should enable when you change the view to "thumbnails" view while viewing the tv series library.
3: if no, install the "artwork downloader" plugin by Martjin, then set that puppy running, it will grab everything you need for your library and will allow you to use additional views in other skins etc too (extra fanart etc)
Something helpful that would help aid resolving your issue, would be either a picture of your settings page, or just write down what you have enabled and disabled in the skin settings/options, mainly to ensure we don't suggest something you've already checked/tried/enabled etc
I hope this is of some help to you,