This has been puzzling me for quite awhile. Why can't we use 2- letter words when we're searching? I've needed to search for a few things containing I, up, and a. Is there a reason for this, or did iEntry just make it that way?

The reason is that you'd receive almost every post as your Search Results.
So instead of trying to search for phrases, search for unique words that you believe would be inside the topic/post you're looking for.

I believe it was built this way prior to iEntry, though I may be wrong.

Alrighty, thanks for clearing that up.

@X-M-O
Yes, it was built before iEntry took over.
I always got mad at that too, but now I realize how much that feature is needed XD

If you find you still definately need words like "up" (which are short but still not as common), you can go to google and search for:

up site:rpgrevolution.com

Where "up" is your search term/s.