In my game, 99% of the monsters, evil NPC's, dremora and undead have left Cyrodiil. Every dungeon, fort and ruin is empty except for placed creatures. Levelled lists are no longer spawning any enemy but animals like mud crabs and rats. I am SOOOO frustrated at this. I don't want to be able to just walk in a place and take all the goodies.
Has anyone ever heard of this? Is this a mod that is doing it? I've deactivated my mods in steps to see if I could pinpoint one that was causing the problem, but nothing. I just put in OBSE 19, so I reverted back to 18 and still nothing. Is it a glitch in the game? Any help you can give me would really be appreciated.
HELP! I'm not being attacked!

You might have better luck finding an answer in the Mods forum. After disabling all your mods, did you wait 73 hours before checking the spawn points again?

I tested at dungeons that I haven't been in yet, quicksaving right outside so I can try the same one again and again. I've had a lot of problems with Oblivion but this one is the worst.

Try a full reinstall of the game.

My answer too. Has been forced to do that numerous times. I′ve actually never had any game with so many problems but still worth all the fuzz