Hi, i do have exactly the same problem as dnorman wrote (sometimes php code is not executed, instead send for downloading).
I am using a Suse configuration with Apache 2.0.53 and php 5.0.3 and some virtual hosts. My memory limit is at 32MB and it still happens sometimes. It now happens more often than in earlier times. I am really getting confused about it, because i have no idea how to reproduce it. I even wasnt able to find something in the log-files
Thanking you in advance for giving me any hint