>My entire application is working smoothly, but there's always that one last unexpected thing....I get the error...
>

I have a feeling that your problem is stemming from the view that is based on other views...

possibly the reason that it works from the project manager is that the dbc is included in the project and is always open when the prokect is open? Do you have views that span dbc's? Do any of your 'nested' views share common source tables?