Number vs. Word Search Bug?

[RoarinRow]

On my main and test sites when I do a search starting with a number, for example '12 many' I get a 500 Internal Server Error message.  But when I search for a word I do not get this error message.

My main and test site are both hosted by Yahoo!

Test site - http://www.avalanchestyle-test.com/forum/index.php 

Now, when I test on my backup site, hosted by iPowerweb, I do not get this 500 Internal Server Error message when I do a search by either number or word.

All my sites are configured the same as far as I know and they are all on SMF 1.1 RC2-1 all have the same mods installed.

1. TinyPortal 0.86                         [ Uninstall ] [ List Files ] [ Delete ] 
2. SMF Arcade 1.3.0-MOD              [ Uninstall ] [ List Files ] [ Delete ] 
3. SMF 1.0.7 / 1.1 RC2 Update 1.0   [ Uninstall ] [ List Files ] [ Delete ] 

Any suggestions?

Edit - I just did a search on '12 Many' on this SMF site and got an 'Error Occurred - too much stress on server.  Search temporarily disabled.  Try again later' something like that, can't remember exact wording.