iRulesLX broken after upgrade to v13, any ideas?

I seem to have found the answer. BigIP v13 ships with two versions of node.js: 0.12.15 and 6.9.1. My code after upgrading was using the 0.12.15 version, which was completely appropriate since that's pretty close to the version that existed on BigIP v12.

However, there must have been something buggy about F5's installation of 0.12.15, because it caused my RPC calls to just hang. When I went into my ILX workspace and told my project to use the new 6.9.1 engine, it started working immediately. Hopefully this will help anyone else who may run into this.