Why is there a difference between live and local versions when testing or debugging applications?

Recently there has been a couple of issues whereby users are reporting issues with the public website or WIT, and when the developer has tested this locally, they are unable to reproduce the issues.

You might find that although you have the most recent code, database and you have also run the schema that this still continues to be the case. It may or may not be obvious, but because the public website and WIT are only generally published by request, it is more than likely that a developer has previously made some changes and that the application with it's changes have not been published yet. It is therefore a good idea to request the application in question be published so that you can eliminate mismatches between live and local versions.