Exception in template helper: ReferenceError: Posts is not defined - meteor

Question

For some reason my app has now inexplicably stopped working in the hosted version (Galaxy & MLab). I am able to save and retrieve posts when I run on local host but on my hosted version it's completely stopped working and now I'm getting this error I have never gotten before:
"Exception in template helper: ReferenceError: Posts is not defined"
I saw that there's a new way to create collections using "= new Mongo.Collection('posts')" but that doesn't seem to make any difference.
This error seems to be happening in all 4 of my helper functions that retrieves the posts and uses Posts.find(), here's one of those functions (userfilteredposts):
Template.userPostsFiltered.helpers({
userfilteredposts: function() {
var currentUser = Meteor.userId();
var selectedListId = Session.get('selectedHood');
if (selectedListId == 0) {
return Posts.find({userId: currentUser}, {sort: {submitted:-1}},{reactive:true});
} else {
return Posts.find({userId: currentUser,neighborhood:selectedListId}, {sort: {submitted: -1}},{reactive:true});
}
}
});
And here is how the collection is being created:
Posts = new Meteor.Collection('posts');
Posts.allow({
'insert': function(userId, doc) {
return (userId && doc.user_id === userId)
},
'update': function(userId, docs, fields, modifier) {
for(var i=0; i<docs.length; i++ ){
if ( docs[i].user_id != userId) {
return false;
}
}
return true;
},
'remove': function(userId, docs) {
for(var i=0; i<docs.length; i++ ){
if ( docs[i].user_id != userId) {
return false;
}
}
return true;
}
});
Meteor.methods({
post: function(postAttributes) {
var user = Meteor.user(),
postWithSameLink = Posts.findOne({url: postAttributes.url});
// ensure the user is logged in
if (!user)
throw new Meteor.Error(401, "You need to login to post new places");
// ensure the post has a title
if (!postAttributes.name)
throw new Meteor.Error(422, 'Please fill in a name');
// pick out the whitelisted keys
var post = _.extend(_.pick(postAttributes, 'name','comment','address','location','neighborhood','map','placepic'), {
userId: user._id,
author: user.username,
submitted: new Date().getTime()
});
var postId = Posts.insert(post);
return postId;
}
});