When I start TwistedBrush in Windows Vista or Windows 7 I get a warning that the color scheme needs to change, is this normal?

Windows Aero schemes are not compatible with all Windows applications. When Windows detects the need to switch modes it changes the color scheme to the standard color scheme until TwistedBrush exits. This does not impact the proper function of TwistedBrush or other applications running.

Starting in version 18.14 for TwistedBrush Pro Studio the option to disable Windows Aero on start up of TwistedBrush is exposed. This means you can allow TwistedBrush Pro Studio to keep the Windows Aero theme. This option is available in the Preferences dialog.