Originally Posted by Grant
Feast, I was shooting with a friend of mine that had exactly the same problem you have experience, although it wasn't the same camera. After a couple of days of shooting we found that he had inadvertently triggered the bracket exposure mode. It drove hime crazy until he realized. May not be your situation but it is a thought worth checking.
I've experienced exactly the same issue, and it's a major problem for me, as I use AEB (bracketing) frequently (HDR). Consequently, I'd normally want to have AEB turned on in it's menu (it's an option to have it set to "off").
I was having strange things happen, in the sense that in single-frame shooting, after taking one shot, the next preview in the EVF would be dramatically under-exposed. Couldn't figure it out, I thought the exposure system was erratic. Normal for me, in initially configuring the camera, I had set AEB to one of the "on" settings. You wouldn't expect this to affect Single shot use, but it does. If I set AEB to "off", the problem in Single AF appears to go away (just discovered this, so only my initial impression).
So the "bug", if you want to call it that, is that I can't have AEB configured and simply switch into multi-frame mode to be able to shoot exposure brackets, as I can on my Panasonic. I have to both change single-frame to multi-frame (from the SCP), and also go into the menus and set up AEB. Note that these settings are in different places, adding to the complexity; AEB settings aren't accessible in the SCP. AND I have to reverse this kludgy process to go back to single-frame use.
I can, and have, saved my bracketing configuration to the rear FN button (seems to be the only configurable button that can access MySet), but this requires that you press & hold the FN button, which makes it more difficult to shoot brackets handheld at marginal shutter speeds, due to muscle tension. If Olympus had provided a user-selectable option for the FN button to work as a toggle, instead of limiting it to press-and-hold, that would be a noticeable improvement, but it's still a work-around, IMO.
For me this is a major issue, and if not corrected, will probably see me avoiding Olympus in future.