i had big trouble with an intensity studio. I think the intensity range has driver issues.. in the end I took out the recent BM software and used the older version this made it work in the apps that didn't see it, but it stopped working in the apps that did lol
i suspect the judder you mention might be down to you using too many layers on too many tabs. I find if I just use the one tab with a few layers, everything is fine. I think clips are preloaded even when not showing, which will slow down your system.