>> Anyway, I get no errors in the console window; it just doesn't show the DSP nodes. <<
Does it show none at all or does it still show the default Log and Email ones?
I just tried this on my Fedora machine and it works as well, I don't have Windows handy to try it there. Obviously I am guessing here but have you tried closing all the editor tabs and cleaning + refreshing your project? Maybe even go to the point of closing/reopening your project in eclipse or deleting the project (do not delete on the actual file system :) ) and then re-importing it back?
Are the new workitems not showing up for reopened existing processes as well as when creating a brand new process?
Are you creating the processes in src/main/resources directory?
I am not sure why in your case the runtime is not picking up drools.rulebase.conf and overwriting the default with it. In the cases I have seen this before was where I did not place drools.rulebase.conf in a folder that was actually a source folder in the project, but it seems this is not the case with your setup. Have you been able to test the same thing on another machine?