XCode Code Snippet Macros Not Working Consistently

Question

Hi, I'm a newbie, but things aren't consistently working for me in the XCode editor.

I'll be in a method, and type "For" (without the quotes of course). What's supposed to happen is the entire For structure appears for me to fill in, right? Well, the For gets highlighted to show it's a key word, but the snippet doesn't show up. At that point, if I type "While" or "Do", that works fine.

While I was playing with this, all of a sudden the "For" started working ok, but the "While" and "Do" stopped working. They would highlight in color, but not show the entire snippet.

Has anybody ever seen this type of behavior in the XCode editor?

Thanks...