If there are issues with the schema files when loading, the IDE opens a dialog showing where the problem is. In this dialog you can edit the files directly and try again, or alternatively abandon the entire load.
Sometimes the issue is that the incorrect load style has been selected. There is no way to change this from the subsequent dialog, which requires the load to be abandoned and started again from scratch. This can be painful especially if the load was utilising advanced options.
We either need to be able to get back to the load options, or be able to change the load style from the subsequent dialog.