When setting up a browse dialogue and a record is returned, select the record and click okay. This takes you to the maintenance window with the selected record active. However if you now movenext etc on the one pk field update the rest of the test boxes stay as is. Did i do something wrong or is this a bug.

When it gives you that error for each field, do you get the red error window?  I'm wondering if the stack trace within that error window contains a call to "CurrencyManager.ListChanged" or "CurrencyManager.OnListChanged."  .NET might be trying to do something when the internal DataTable changes rather than waiting for the row to be initialized.