CakeAlexS
Works for me. Update guitar rig software and sound device drivers.
I'm sure you've done this already Sharke, but Alex is right about the Guitar Rig update.
When Guitar Rig 4 first came out, it did have some problems that were fixed with an update.
I use Guitar Rig 4 Pro extensively. I use it on Vocals, Drums, Guitar, Bass. I haven't had a crash with GR4 since the first update, and I think there were 3 after that IIRC.
I'm not doing the 'it works for me' thing, you know me
way better than that. What I am saying is, I have seen problems with GR4, and I was able to fix them with an update, but that was quite some time ago.
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I too have also seen problems with projects going bad after a certain age. One thing that helped was using Auto-Save, and every once in a while, opening up the Auto-Save file, then saving it as the main project name, thus overwriting the main project while not losing any work. Hope that makes sense. You have to be quick about it, if you open up the Auto-Save project, then you'll have an Auto-Save copy of an Auto-Save file, and the file names get really long and confusing. You have to do this from the very beginning of the project ... if you have an existing project and then turn on Auto-Save, you're just copying the problem, if that makes any sense.
It sounds like a pain, but it's not a big deal at all really.
Good luck!