Input buffer overflow with Apache

Hi I am hoping someone on the list can save me from the grief of an OS re-install. I carelessly allowed the disk on my Red Hat 6.2 server to fill up. I have fixed the damage, apart from Apache. Here is the problem.... When the disk was full, Apache keeled over logging the error: "input buffer overflow, can't enlarge buffer because scanner uses REJECT". It didn't recorver when I created some disk space. So I have deleted all Apache files and done a rebuild from scratch. First I tried a basic build which started ok. But when I compiled in the PHP module I have been getting the same error as before, with Apache refusing to start. Can't find anything to help on the web, so I would very much appreciate some advice Geoff Caplan