Hola

Se mas especifico con tu pregunta, ya que es algo Escueta (palabra tipica de mi pais para indicar que es poco entendible o incompleta)

Utiliza la utilidad de PB, llamada DEBUG, y define un breakPoint al principio del codigo, para ir corriendo la aplicacion y definir el punto exacto de tu error o verificar si es realmente el ShareData el del problema...

Anexo Informacion sobre ShareData y cuando no se debe utilizar

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Computed fields in secondary DataWindow controls A secondary DataWindow control can only have data which is in the primary DataWindow control. If you add a computed field to a secondary control, it will not display when you run the application unless you also add it to the primary control.
Query mode and secondary DataWindows When you are sharing data, you cannot turn on query mode for a secondary DataWindow. Trying to set the QueryMode or QuerySort DataWindow object properties results in an error.

To share data between a DataStore or DataWindow and a RichTextEdit control, use the DataSource method.
Crosstab DataWindows You cannot use ShareData with Crosstab DataWindows.
Distributed applications You cannot share data between a DataWindow control in a client application and a DataStore in a server application.

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Otra posible causa del poblema podria ser que necesites aplicar algun parque.

Confio que mis comentarios te auxilien de alguna manera. Caso contrario, favor complementar la pregunta, para tener una mejor idea de tu problema.

Saludos cordiales.