Uncheck "Use shaders" in the Graphics tab of the Moviestorm Settings screen when building sets and making the movie. This will free up valuable memory for actual production and will speed up the process. Turn shadows back on prior to rendering and make your lighting adjustments then.
Exporting your movie can take several minutes. For best performance, turn off all other applications, and don't do anything else on your computer while it's rendering.
If you want to try some experiments with your movie, make a copy of it, and work on the copy. You can use the "Save As" command from the drop-down menu on the standard "Save" button.
