I'm just going to add.
You said you used objects recently added to your game? And then organized them into their own groups? This could be the holdup. It's not a bad thing that you put them into their own groups, that's quite fine, but when you did this did you make sure to not only save the objects but export them from Object Maker as well? I've noticed that a lot of the time an object shows up in a map in Map Maker but not in-game, it's likely due to that particular object having not been exported from Object Maker. Exporting the object usually fixed the problem and everything appeared as it should. The Save button in Object Maker works the same as it does in Map Maker; it only saves progres on something you're working on, but for you and others to use it properly, it must be exported.
Give this a shot if all else fails, it won't effect your map, or at least it shouldn't. Once that's all done give the map a test-run in-game to make sure the objects are showing up as they do in Map Maker.
Side note: if an object you used is a default object that the game came with, and isn't showing up in your map, export it from Object Maker but TO ITS OWN GROUP! Don't tamper with the "vanilla" files, this will only cause more problems
By the way, awesome map!