As I said, all crimes except pickpocketing (and maybe tresspassing, i haven"t checked) don't work. I can steal items freely in plain sight without being confronted in any way, and even if i attack guards, all they do is immediately draw out their weapons and attack me, no bounty, no "STOP RIGHT THERE CRIMINAL SCUM". This happens on all saves of my main character, of course; if i make a new character or load a save of a different character, everything works, which leads me to the conclusion that no mods are causing this. Yes, Oblivion is patched, I really don't know what to do.