A friend of mine was having fun and games with the installation of a BPD snapshot from his Process Center to a connected Process Server, via HTTPS.
The solution to the problem was to ensure that he had: -
<deploy-snapshot-using-https merge="replace">true</deploy-snapshot-using-https>
in 99Local.xml ( or, better still, the overriding 100Custom.xml ) on BOTH the Process Center and Process Server cells.
However, on the voyage of discovery, he realised that he could learn a LOT about the way that the process works by enabling JVM-level tracing.
The particular trace strings that made a difference were: -
com.ibm.bpm.fds.*=all:ProcessApplicationLifecycle=all:com.ibm.bpm.fds.repo.util.ContributionHelper=off
and: -
WLE.*=all
Nice :-)