php4 imp problem

[RJ45]

I ahe configured imp+mysql+apache+ssl on my Ultra 60 running FreeBSD
5.2.1/sparc64

the problem is that when I list my inbox and I click on one message the
apache child process doign the imp stuff dies:

[Wed Mar  3 21:51:15 2004] [notice] child pid 18104 exit signal
Segmentation fault (11)

I ahve no clue about this error..
I am more than sure that the configuratoin is okay because the same
configuration works on i386.

anyone has any hints ?

thanks

Rick