Hi,
Assuming you don't have some large amount of exposure compensation dialed in, or some other setting incorrect, I agree that the problems you are seeing are odd. I've never heard of a combo of symptoms like you are seeing. But it sounds as if both the aperture is not working properly (staying wide open, i.e. no signal from the camera reaching it to tell it to close down) *and* the reversal of AF/MF switch functions.
The only things I can think of that would explain both are either a mis-match of the electronic contacts *or* a mixup of instructions in the camera's central processor unit.
Since it's happening on two lenses, and those lenses both work properly on another camera, it has to be a problem with the 30D body itself. Another possibility occurs to me, that for some reason the lens is not fully turned to latch in place. I'm thinking maybe the electronic contacts between body and lens are not matching up correctly. I havent' seen this on either of my own 30Ds, but have seen "weird stuff" occurring with an acquaintances D200 when their lens wasn't fully latched in place.
The suggestion to remove the button battery and leave it out for a few minutes is a good one. Doing this reboots the camera completely and clears it's "memory". It will mean resetting your date/time, custom functions and all your other personal menu settings. But, it resets the camera to "zero" and can solve problems that are "stuck in memory". It might be a good idea to replace that battery, too, although they tend to last a pretty long time (maybe 3 to 5 years).
Dusting off the contacts isn't adequate. I'd suggest using a lint free cloth or swab (not a cotton swab!) and wiping them clean with isopropyl alcohol (aka rubbing alcohol), at the very least. This removes any finger oils and possibly some some light oxidization that might be on those contacts and interrupting the very low voltage flow of communication between camera and lens.
Actually, it's a good idea to wipe off the button battery with alcohol, too.
Also carefully wipe clean the BP511 battery contacts (on the battery), the contacts for the BP511 batteries inside the grip, and the grip-to-camera contacts.
There are better products for cleaning electronic contacts, such as De-Oxit.
Some people suggest using a pencil eraser, but I think it's a pretty bad idea. Far too easily small bits of eraser can get inside where you don't want them and cause problems.
For similar reasons never use a cotton swab - aka: Q-Tip - either as they shed tiny, fine cotton fibers that are incredibly tough and can actually jam shutter mechanisms, etc.
Hope one or the other or both these ideas help. Keep us posted.
