Okay can you tell me a couple of things, firstly what are the names of some of the lookup tables and their associated custom fields? Any special characters or similar? This issue may be caused by one field having a name that cannot be mapped easily to OData, for example the field name “Project Id” would map in OData to “ProjectId2” to prevent conflicts, similarly names with spaces, underscores and periods are modified. Previously these names have caused some issues in Bulk Edit.
Secondly you can get more information in the browser “developer console”, F12 in IE or Chrome, then click the Console tab and then reload the page. Here you will see some more details of any errors occurring during loading, if you could copy / paste that here that would help me help you.