Ha ha. me too, I shot three days at WDW once at iso800. day and night. How I missed that is beyond me. I did notice that the shutter speed was always 1/2000 or higher, but somehow that did not click!! Welcome to TMIP too!
been there done that, got the t shirt, half of a family wedding before i realized i had not upped the iso from 100 for outdoors, and the wb to incandescent, so for a few i shot 100 iso, sunny wb, and i couldn't for the life of me figure out why the camera was trying to stay open shutter for eternity, 20d days
Sounds familiar. I host a huge car show each year, and spent the first 2 hours walking around and photographing cars before deciding to review a shot and finding it a weird shade of blue tint. Went back through other shots and they were all the same strange color. Light bulb went on above my head when I realized I started the morning by manual white balancing off a reddish tent which was throwing the color off for a shot of a car in the tent...and I never switched the white balance back for the rest of the shots which were outdoors in normal lighting.