Advance move freeze bug was/is an elusive bug, I had it for one week recently, like a cold, lots of crashing. At the same time I noticed autosave was playing up, so I disabled auto-save and I've had no more freeze crashing when using advance move. not sure if related or not.
Good billboards are back. It's worth mentioning that too many billboards will hurt frame rate. Even just the small window billboards can reduce FPS by 50% if you exceed something like 1500 billboards give or take system performance. That's a lot of billboards before performance drops sharply, but still better to use normal non-billboard windows if you're adding hundreds in same area.