Another odd thing with the SkinManager.Effects.AllowGlowing property when it's turned off.
I had an issue in my 'big' app were when I resized the main form all my trackbar controls would go crazy with the thumb buttons bouncing all around their tracks until I stopped resizing.
When SkinManager.Effects.AllowGlowing is set to true – no bouncing, they're all stable.
Whenever I tried to create a demo app to reproduce it, the demo would work fine – didn't previous realize that the AllowGlowing was on by default and OFF in my app.
Haven't had the time to try to recreate the problem in a demo app now that I know what was causing it (SkinManager.Effects.AllowGlowing set to off).