Yup, me too.
Look in your c:\windows\fonts directory... any font that ends in ".fon" doesn't work with Vegas. In VV3, it isn't even listed in the Text generator.
They removed raster fonts in the latest release because they render badly.
From my understanding it was actually an oversight that you could use them before.
"Script font types" is somewhat of a misnomer. The font you're having trouble with isn't a problem because it's "script"; it's a problem because it's a .fon file. I have several "script"-ish fonts that all work fine in Vegas because they are .ttf TrueType fonts. When you look at your list of fonts, those with a "TT" icon should all work fine, but those with an "A" icon won't.
btw, the legacy text generator will render these I think, but you're probably just better off using another "scriptlike" font that will work. If you don't have one, its pretty easy to find free fonts to download on the web....
To be pedantic, script.fon is actually a vector rather than a raster font. The vector fonts are only included with Windows for compatibility with truly ancient applications though and have quite rightly been removed from Vegas' font lists again.
Vegas should be able to handle any True Type font. If you don't have the exact font you want/need, the web is overflowing with them. Some sites have thousands, many are free for the taking.
Do a search for: true type fonts.
All you should have to do once you find some you like is unzip them or copy them to the font folder which by default is under Windows in you root drive directory.
There are a few utilities to look at fonts after right clicking on them, which is handy.
Also useful is a font manager - get a ton of fonts and you're wasteing resources haveing them all load with windows.
Also, also useful is creating a directory just for fonts, named something other then the default name "fonts", once you get a font manager. Often in windows just clicking on the font folder, usually by accident in my case, will register and/or install everything in the folder. I've got near a thousand on the hard drive, so obviously this is not good.