Single page not showing — mod_rewrite problem?

I have a list of pages on my blog (under Content), which all appear fine except for Stats. The page shows without mod_rewrite (via the ?page_id=xx extension as seen here), though I’m not sure why since the other pages are fine either way. With Stats, I just get the “sorry, no posts matched your criteria” error.

“Stats” also has some PHP code in it (executed by the PHPExec plugin), but then again, so does my “Archives” page which has no problem. Anyone know a fix? Thanks in advance!