Hi Erin,
For reproducing the error you can try following.
Go to Advanced search >> Keywords "number" and "search entire posts" >> Search in forum "Gmat Problem Solving". I tried to search for same string in another online discussion forum betthegmat dot com (which is think is built on same technolgical platform as TM is), just to make sure that there is no problme with my PC, and the search works absolutely fine there. So it seems there is some problem with TM's search engine
Quote "I'm planning to move this forum to a better server, so I'll try to keep this error in mind when I do that. I hope it solves the problem."
Thanks in advance for moving the site to a better server. Just curious about one thing, do you earn any revenue from this website or its just pure social service
P.S. Do let me know about the grammar mistake, because I am not a native speaker of english
Cheers !!