Hello Scott,
I'm afraid that without having a isolated runnable example of the behavior will not be able to do much.
As a wild guess (might not be relevant to your case) is to check whether all foreign key fields have default value defined in the schema.model. This assumption is based on the statement that - ` I do have several Foreign Key dropdowns in the grid.` and the fact that the error occurs while initializing DropDownList widget.
Regards,
Nikolay Rusev
Telerik
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