Great! You finally found the problem. It seems that the process editor is not setting the process package by default. I mean, if you create a new process in pkgA, then the package of that process (in the definition) should be pkgA.
Try to configure the package name using the editor. I don't remember if that is possible in the version you are using.
If you want to do a quick test, just open your process with notepad using webdav and add tns:packageName="defaultPackage" into your <process> tag. jBPM compiler will look for that attribute and if it doesn't find it, it uses "org.drools.bpmn2".
Best Regards,