Matthew Hoag

Confirmed. Zombie, Skeleton, Spider, and blaze not spawning in my current map (created originally 1.8.9 and now running in 1.9 Pre-2).

Even in hard mode, 1.9 Pre-2, Game Mode 1 or 0, spawners not spawning when within range. Tested on naturally generated Spider, Zombie, and Skeleton dungeons as well as "custom" spawner set to blaze in overworld via spawn egg. Windows 10 environment. Is there a game rule that affects these spawns as opposed to natural hostile spawns?

Same thing happened to me. Every single one of my chests at my home base is empty, and all paintings/item frames attached to them have popped off and were found floating on the nearest block. I've played for close to a year on this world. Not happy that all that work seems to be for naught.