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Some notes about interoperating with different WebLogic server are provided here: http://docs.oracle.com/cd/E24329_01/web.1211/e24375/wls_interop.htm#i1121383
One thing to note is that the default message mode has changed in 12c, from multicast to unicast:
The WebLogic Messaging Bridge has troubleshooting advice that may help:
Are you running multiple bridges on the same JVM?