Not serious bugs at all, just engineering quality issues...

Simple reproduction steps:

1. Enable Mini-Player Mode
2. Log off user account
3. Log on user account
4. Open Windows Media Player
5. Minimize Windows Media Player

Now point over any of the buttons of the player, and you'll find the
tooltips lack drop-shadows. Now:

1. Disable Mini-Player Mode
2. Minimize Windows Media Player
3. Enable Mini-Player Mode

This time you'll find the tooltips behave properly: drop-shadows appear
correctly. It seems like the drop-shadows will not show unless Mini-Player
Mode is enabled manually within a session.

Second, without the need for reproduction steps, is that the Mini-Player's
volume control (volume-slider) doesn't respect the color scheme of the
player.

Thanks.