I can confirm when clearing a scene, and loading another, messiah will crash most certainly in a few minutes. I’ve made the habit of closing messiah, then relaunching to prevent these crashes, and it has worked so far. Fortunately, it doesn’t take long for messiah to relaunch. I’m on Dual AMD 1.4 Ghz with 1.5 RAM and Quadro 2, so I don’t think it’s my hardware.
I’ve never had a problem with crashing when using “Stop All Rendering”, or just closing the preview window. I never render in the viewport. It caused problems for me way back in December on verion 1.5. I always use the window preview (unless I’m using limited region).