I tried resetting my custom white balance while out yesterday. I shot in a few different areas with different lighting and reset custom white balance without a problem. Went to reset in afternoon and came across a problem.
1. Took photo with focus point over white
2. Opened menu and selected set custom white balance.
Normally the photo comes up and I press set, then go in to white balance and set to CWB.
This time, when I tried to open 'set custom white balance' a black screen came up with "busy, please wait." I waited till screen timed out and nothing happened. Have tried several times since, shooting in different modes, different lighting etc and I cannot set custom white balance. It keeps saying "busy, please wait".
Any suggestions? Please
ETA: I am using a Canon 60D