Performance Report Manager not posting png files

PRM on 3.5.1u1 will not generate png files for scheduled reports. However, when I run the report manually and post manually from the generated report, it works just fine. Any ideas on what I'm missing (directory ownership hasn't changed or anything like that)?
[269 byte] By [mnlott] at [2007-11-26 6:00:18]
# 1
Do an unsetenv on DISPLAY environment variable and restart all services on the server layer from the same shell.
nits001 at 2007-7-6 13:21:07 > top of Java-index,Administration Tools,Sun Management Center...