(hat-tip to wizofoz for the thread title, per his AF points)
Several days ago I popped on a new lens (Voigtlander SLII 90mm) to take if for a spin. I was snapping away when I noticed the shots began to look less and less saturated. It was a bright overcast day (late afternoon) and the place I was shooting didn't have a ton of rich colors going on so I wasn't really sure what was up (just getting used to the lens? something else?).
Anyway, after reviewing the images you could almost see the color leaching out frame by frame until they were pretty radically desaturated - not B&W but very noticeably. I popped on different lenses (old As, DA Ltds, etc.), took pics of vibrantly colored flowers, all with the same result. In video mode the same desaturation was present in the live view.
None of my settings had changed, things just became universally washed out.
Then last weekend I decided to try to start from a baseline and see if I could see what was going on. I reset to the factory settings, updated my firmware, configured my personal settings, took a photo and - ta-da! Color was back to normal.
Any ideas on what the heck was/is going on?