andreas_manessinger

This happens at times. Try to lightly (without force!) twist the lens. It will likely click audibly and the image will be there. I'm talking about an angle of half a degree or something like that. If you think the lens sits well, press the lens releas button, remove the lens and mout it again. If the lens is stuck, don't use force, ask a professional. If you get to the same condition even after unmounting / mounting a few times, the contacts of lens or body may be dirty or damaged. If you have another lens, you could tryy this, or you could again ask for professional help.

Harry, I suppose the Olympus firmware updater is another victim of Apple's newly introduced System Integrity Protection. Try to <a href="https://www.quora.com/How-do-I-turn-off-the-rootless-in-OS-X-El-Capitan-10-11">turn SIP off</a>, do the update and then turn SIP on again. I guess it will work. You could also wait until Olympus comes out with their new Firmware for the E-M1 (announced for this month). I am sure they are aware of the problem and expect them to come out with a fixed updater.

When using the converter, you can specify the DNG version to convert to. Personally I haven't used the DNG converter in a long time, thus I can't say what the exact DNG version supported by CS3 is, but if you stick to the right version, CS3 can open it. As far as I remember, the converter tells you about compatibility levels in its help. As Greg already said, you can just as well buy Lightroom, and for the few occasions when you need Photoshop (for instance when you want to use "Edit / Transform / Skew"), you let Lightroom render to a DNG, edit the DNG in Photoshop, and finally finish it in Lightroom. That's what I do.