I imported a large Excel file and the import seems to be stuck. When I reload the project, the dialogue is gone but I see only part of the data I imported. What went wrong?

Nothing went wrong. The import is still running in the background. If you go back and reload the project at a later time, you will see that all the data has been added to your project.

Note

This issue has been removed with PoolParty 5.5. and the introduction of the import assistant.