PHP crashes in rfc1867.c:173, because the variable "rem" is made smaller 2 bytes for every file upload input than it should. a hacky fix is to add the following line to the file rfc1867.c, around line 435:
  state = 0;
  rem -= (loc - ptr);
  ptr = loc;
+ rem = cnt - (buf - ptr);
  break;

but this is not enough imho. in line 173 it should be checked if "loc" is NULL.

I've a complete dump of the form-data and the apache environment, so contact me if you need further information.

Tested with PHP-4.0.6, Apache 1.3.12, Linux 2.2.19, IE 6.0 and NS 6.1