You were having JMX properties set in s4 VSE vmotpions file with port 9004 set.
Since there is a VS already deployed on this port, it couldn't use that when starting s4 VSE.
Release : 10.4
Component : CA Service Virtualization
We renamed the s4 VSE specific folders from VSBuilderSessions and VSERecordings folders.
For now we commented the JMX properties for S4, if you want to continue the monitoring you can use a different port and configure the same on the monitoring tool.