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You probably hit Ctrl (cmd)+5 for the blue channel.
Go to the channels panel and click on the top thumbnail that says RGB.
Or Use Ctrl (cmd)+2 to select the composite channel (rgb in your case)
The difference is shortcuts that R-Kelly and Bo Lebeau gives can be explained by the fact that the shortcuts changed circa CS3/4, it is possible to get the shortcuts that Bo describes by checking "use legacy channel shortcuts" in the edit>Keyboard shortcuts, but ones misses the easy to remember CTRL/Cmd+O and CTRL+1 to fit or show pixel size.
Pierre, you're right. I had the "Use legacy channel shortcuts" selected.
Why it was selected I have no idea, I'm usually good with using the latest techniques.
Oh well, I changed it and everything is up to date in river city!
Bo, you are free to do as you want! Some muscle-memory is hardwired to well that it is useful to many to have those shortcuts.
But it's when I learned about the reason of the change (suite consistency, plus the two shortcuts quoted before) that I decided to fight my old habits...
R_Kelly, thanks for that reply! You were right about Ctrl+5... I'm always hitting Ctrl+T so that makes sense. Also, knowing that Ctrl+2 gets me out immediately helps a lot, because initially I was able to select the Revert function in order to get it back to normal, but after testing it again today, I noticed that the Revert function can't be selected until after a brush or something is used on the image. I don't remember how I got out of that problem in CS4, but it definately wasn't this confusing then.Weird. Anyway, thank you and thanks to everyone's help.