Drupal help - page dissapearing when editing a node

We have a big drupal site that had it's data inserted by using a custom made module. The nodes show up correctly but when we try to edit them we get an empty edit window and no errors on drupal log or apache log. This may be an issue with the taxonomies for nodes or an issue with the HTML in the data, we don't know. We have full access to the machine this is hosted on and need to know what CHANGES need to be made to our nodes/configuration/code so ? that the nodes we have can be edited. This being such a large website remigration of contents is not really possible. We need to fix what we have. An example of the node we can see is on? [login to view URL], but when we attempt to edit it we get the screen you see in [login to view URL]~foxtrot/[login to view URL], so it is like a WSOD but not really. We can install additional modules for debugging and turn logs and restart servers if that is required. We need a problem description and a fix for it (that is not "recreate all nodes by hand")