HOW TO PATCH

This patch is made for the following module:
  Media: YouTube

1 Check if all needed modules are enabled:

  modules enable:
    Media    7.x-1.0-beta4
    Media Internet Sources    7.x-1.0-beta4
    Media: YouTube    7.x-1.x-dev

    Styles    7.x-2.0-alpha6
    Styles UI    7.x-2.0-alpha6
    File Styles    7.x-2.0-alpha6

2 Configuration:
  2.1 -> admin/config/media/types/manage/video/display/media_preview
    set format of preview to
      File style: medium
      ( doesn't matter directly, you have to make changes on the selected format then):
      To be correct, the patch will display a medium image, so to make the names match here, take this
      But you could also create other formats, if you look into the code and make your changes there
      (media_youtube/includes/media_youtube.styles.inc near Line: 274)
 
  2.2 Then go to:
    -> admin/config/media/file-styles/edit/medium
      select youtube and have a look for the "Preset" field
        no colorbox should be there

3 Patch it
  3.1 now patch with patch to the media_youtube directory ( files in patch begin with /include )

  3.2 be sure you "CLEAR ALL CACHES" on the performance admin page...
  3.3 also check if the colorbox configuration "Enable Colorbox load" is selected !
    ->admin/config/media/colorbox

4 create a "media field" in a content type (e.g. "page" or where you want)
  4.1 select video, and youtube checkboxes
  
  4.2 go to "manage display"
    select the "preview" format (or what you have choosen on the first configuration step)
  
5 create a content, and insert a youtube link
  5.1 save content
  
6 Finish, now lets have a look at the page, and now your youtube video should be displayed in a colorbox after clicking the image.