Something that's been bugging me for a while and is still a problem in Max 2016 is that whenever I open the picture preview in the VRayHDRI map the window opens off-screen and I have to use the Windows-Key+Left/Right shortcut to bring it back into view. This doesn't happen with the built in bitmap map preview window. I'm running three monitors, I don't know if that has something to do with it. It's easy to work around it, but it's pretty annoying still.