Hi Bob,
I'm away from home right now, and I haven't been keeping up with things real close, but just checking in from time to time. lol I'm far from an expert on any of this, but I'll give you some of things I've ran across.
One of the things the will cause ST to crash about any host that it's running in is error messages. You can check this by running it stand alone, and trying various things. A good example that I had was trying to load a combi that I had goofed up. In stand alone I would get three error messages in a row (sound not found, or something like that). In a host, trying to do the same thing, I would just get a bad crash and no error messages.
When you do have a bad crash, be patient with it and you shouldn't have to reboot unless you would just rather go that route. A crash loads a bunch or Dr. Watson stuff that ties up your machine and takes a while to run. Give it the old three finger salute, find that (error collecting) process and kill it first, then your application process.
Noise between switching windows is often related to asio and sound card issues. If you do a search of the forums here you should find several threads with some really good info in them.
I don't have the tts-1, but I researched it a little, and yes, it is reported to have some very good orchestral instrument sounds, especially in the upper banks. Also, since it is a synth, those sounds can be "tweeked". Here is a good article on it, in case you haven't read it already.
http://www.soundonsound.com/sos/jun05/articles/sonartech.htmThere is some good info on ST at the kvr forums, but finding it is a royal pain. Find the esoundz slot over there and that can help narrow your search down. There is also some you-tube vids that help.
And yes, I'm going to sell my SD2. I don't play live anymore except for few gigs here and there with a local band, and I don't use it anymore. It's been sitting on a shelf for about two months now, so I going to fine it a happy home lol. PM me if you're interested.
Hope this helps and have a great day.
Jim