Put a TsPanel in the TsNotebook and set the anchors of the panel to none (the panel remains centered when you resize the form).
Now manually resize the form: you can view a problem of redraw/refresh (check also the image in attachment). If you disable the sSkinManager, all is ok.
Note.
You can try every graphic component instead the TsPanel.
If you add a panel as bakground of the TsNotebook and put your component in this panel, the problem goes away.
I'm using Delphi XE2, AC 10.05 BETA and Windows 7 64 bits.