I'm having an odd error using the SharePoint 2010 REST API. I have a site that has 4 lists with a parent/child relationship. I'm using REST to create an interface for this using Datatables. Suddenly one of the tables has stopped working for the users I have discovered that one of the REST queries now returns a 500 error.
The query works without the filter and I can even see the values that it should be filtering if I remove the filter. This only happens for users that aren't Site Collection Admins which leads me to believe it is a permissions issue but the users all have the correct permissions and can access all of the items so I'm stumped.