I'm having big problems with heavy scenes and interactive rendering. I have a few trees (instanced proxies) and a lawn with a corona scatter scattering grass tufts. Sometimes it works, but most of the time Corona just gets stuck in a loop and 3ds max starts flickering and blinking every ten seconds or so. Even if I turn off the scatterer and keep just the trees (20 or so), it's just stuck. I've included a screenshot of my task manager while it happens and as you can see, it loops and never goes above 50% ram.
While this is happening, the VFB and max gets unresponsive and I have to hammer the "Stop" button until it registers.
I think I started another thread about this when I first started trying Corona, but I can't find it now. When I ran into this problem that time I was on a different computer, using a different operating system, working on a different scene, but got the exact same thing.