My MetaMatrix server won't start after changing the -Xmx value on MMProcess, how can I correct this?

Issue

• I changed the -Xmx of the MMProcess to a value that isn't supported by the JVM and now I can't change it back in the console.

• I've also tried modifying it in .../config/config_ns.xml and restarted but that doesn't work either. 

• It keeps using the command line and values from the last time I was able to successfully use the console.