testOr.js

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var FooSchema = new Schema({
  dob: { type: Date},
  num: {type : Number},
  test : {
    bla : {type: Number}
  }
});

FooSchema.virtual('virtualpath').get(function(){return 'Ima virtual';});
mongoose.connect("mongodb://test:[email protected]/test");
Foo = mongoose.model('Foo', FooSchema);

Foo.remove({}, function(err) {
  var f;
  f = new Foo({
    dob: Date.now(),
    num: 1,
    test : {
      bla: 2
    }
  });

  f.save(function(err) {
    Foo.find().$or([{'test.bla' : 2},{'test.bla' : 3}]).run(function(err, doc) {
      console.log(doc);
    });
  });
});

Thanks for the reply. It smells like a mongo version issue. Verifying now.

Alright, keep me in the loop, I'd be curious to know the resolution of this issue.

All good after updating to mongodb 2.0.5. Sorry for the false alarm and thanks again for the help.

My pleasure! Glad to hear it fixed it the issue :).