I found errors in TIB_ActionPost.StateChanged and TIB_ActionCancel.StateChanged that prevent Enabled property from changing properly:

Instead of

Enabled := Assigned( ADataSource ) and
Assigned( ADataSource.DataSet ) and
( ADataSource.Dataset.NeedToPost ) and
( ADataSource.Dataset.State = dssSearch );

is should probably be

Enabled := Assigned( ADataSource ) and
Assigned( ADataSource.DataSet ) and
( ( ADataSource.Dataset.NeedToPost ) or
( ADataSource.Dataset.State = dssSearch ) );

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Serge