Problem 1 - If the Twilight Skin is the active one when you start up MC and tell it to play the 1st track it takes over 12 seconds to load the active/selected TrackInfo Plugin. With any other Skin it takes less than 1 second.
Problem 2 - If the Twilight Skin is in "Nite Mode" and you switch to a different skin any/all images that skin uses are being darkened. Try switching from the Twilight Skin to the Modern Cards Dark Edition Skin and take a look at the Rating Stars, Volume and Progress Bars and you will spot that they are a lot darker than they should be. Thankfully simply opening and closing the "Skin Effects" window restores the skin back to how it should be.
Problem 3 - If you start MC with a different skin the "Skin Information..." window will display Today's Date but no Sunrise or Sunset info. If you then switch to the Twilight Skin, and twiddle you thumbs for over 12 seconds while MC switches skins, the "Skin Information" will now display Today's Date plus the Sunrise and Sunset times; and will do so for any other skin you switch to.
Problem 4 - If during the period between Sunset and Sunrise and switch from any other skin to the Twilight Skin you should spot that the Search Bar, The Player Tab and all the ScrollBar backgrounds are White and not Grey.
Problem 5 - Over the last 10 days there have been days when the routine used to Obtain the Sunrise and Sunset Times has either failed or obtained bad/incorrect data. On at least 2 days it never displayed any Sunrise or Sunset times, there were at least 2 days where the Sunset Time was obtained/shown but since thee was no Sunrise Time the daft thing stayed in "nite mode" all day long. There was also one day where only the Sunset Time was showing but it was claiming that the Sunset Time for the UK was 19:00 and not the Real Sunset Time of 17:30