It appears that the latest version of Jira that we upgraded to does not support previous validators and post-functions we had used in various workflows.
The two specific ones we're concerned with are:
1) Validating a custom field on workflow transition
2) Post-function to assign an issues to a Project Role on a workflow transition
Both of those features don't appear to be available in the Validators or Post-functions in Jira 5. I have had to remove them from the workflows to be able to continue to transition issues through the flow. Did that functionality get moved somewhere else, or was it removed entirely?