The SeMW Extensions up to Version 1.0.8 are not compatible with the new VEGAS Pro 15 and will cause it to crash on startup unless certain extensions are disabled. I've now released Version 1.0.9 that will work with VEGAS 15. Download it at:
@Satevis There is an issue in VP15 whereby the Preview Levels extension shifts up the row of native Vegas buttons above the Preview window, and crops the highlighting of the buttons at the top and bottom. That makes the highlighting of the buttons difficult to see. This is mostly important for the Split Screen View button.