[Offler]

So to have perfectly clean experience I reinstalled XBMC and applied the skin on the fresh install to see, how complicated it will be to add libraries and all the stuff in a manner I prefer.

Missing slider:
Sources > Video > Add videos > Browse

Once I see the directory structure I have similar problem was in Main menu.

Window trasparent:
Sources > Pictures > Add Pictures
Sources > Pictures > Add Pictures > Browse
Weather - Window for selecting a location was transparent, but only for the first time.


Inactive slider:
Video screen > Video menu
I usually enable Deinterlace and then "Set as default for all videos".

Movie information > Refresh
When you change the data, new posters have to be downloaded. If menu is closed/changed too early it may not display new poster and art correctly. It may be required to close XBMC and start it again to fix this. Also Progress bar which informes about downloads may be desired to activate.

Video screen
When opened Video/Audio settings Volume and Video position hide. Controls remain visible, but inactive.

Back Button/Return to Parent folder
XBMC allows to Disable/re-enable feature which allows to display ".." or "return to parent folder".