I'm using the 15.5.4.12 build.
1) Start the Nevron User Interface C# Examples program which comes with the toolkit
2) Select Edit ->Palette and select Longhorn
3) Select the List View example from the C# Examples All Examples tree entry
4) Notice the column header text in the List View example is black.  It should be white.  In an older license I have it is white.

Can this be fixed soon?

Update: I also noticed that when using the Longhorn or Blue palette that the tooltip foreground text is showing black instead of white now.  Both of these are regressions from the 15.4.24.12 build.  To reproduce do steps #1 and #2 above and then look at the Command Bars -> Command Appearance example.  Hover over the commands with tooltips.  The text should be white.