Forum Moderators: Robert Charlton & goodroi
Google searches are NOT case sensitive. All letters, regardless of how you type them, will be understood as lower case.[google.com...]
By any chance is one of those search terms "OR", which is taken as a Boolean operator when it's typed in uppercase?
Compaining about Some Google Missteps (seomoz) [seomoz.org]
Scroll down to about one third of all comments.
It's basically a QnA by Matt Cutts.
On why caps DOESN'T make a difference.
Part of the issue is that "it" can be a stopword in some cases, and upper/lowercase makes a difference, e.g. IT usually means something different than it.There are very very few words where capitalizing makes a big difference in the word sense. (...)
That said, I have heard people ask about this before. I'll send a pointer to your post to some webranking people, but I'll mention that in the past we've viewed as not as big a help as other things we could do.
Perhaps this has something to do with your problem.
Or perhaps not.
I WOULD SAY ABOUT 90% OF EVERYONE ON THE NET HATES ALL CAPS THESE DAYS AND I DON'T THINK IT MATTERS IF YOU'RE #1, THEY STILL WON"T CLICK ON IT...