So after an hour or 2 of play D3 crashes which then crashes demonbuddy. I think the D3 crash is caused by demonbuddy trying to access some memory space that has now changed since materials are no longer stashed.
I've been using demonbuddy over the past few days and it happens every time...
Mine is doing the same thing with a demon hunter, I found that if I kill demonbuddy and reopen it without closing the game it will start working again. Quite annoying. I think it has to do with a kiting bug or avoidance bug in trinity.