"busy" Error Yet another Canon 20D question. I have been shooting both film and digital at weddings for the last two weeks. I have been very impressed with the 20D (I shot Nikon for 22 years). However, I have had my share of camera errors on the 20D. Lately, it shuts down in the middle of shooting and the LCD panel reads "busy." The busy error does not go away when turning off the camera. At first I assumed that the buffer was maxed, but I'm only shooting in single shot mode. Eventually, after my assistant goes through many processes (changing the lens, batteries, Mem cards) the "busy" note goes away. Here's the set-up, if anyone has an ideas they would be greatly appreciated! 20D 17-85 Canon Lens (IS both on and off at times) Sandisk Extreme 512MB Card Vertical Grip with 2 511A's 580EX Flash The note has appeared in both B/W mode and color- Anybody had this problem? Thanks!