I ran the generator taking all defaults except for selecting LESS rather than SASS. There are two problems with the generated code.
In routes.js the routes generated are;
app.use('/api/things', require('./api\thing'));
app.use('/api/things', require('./api/thing'));
app.use('/api/users', require('./api/user'));
and in socketio.js the sockets registered are;
require('..\api\thing\thing.socket').register(socket);
require('../api/thing/thing.socket').register(socket);
That is two thing entries, one with the slash reversed.
I'm running Windows 10, generator v3.0.0-rc4, npm 2.7.4 and node v0.12.2. I've tried cleaning all caches and reinstalling the generator.