The following simple macro works 90% and crashes 10%. The macro simply applies
the "Text body" style from style list. If it crashed 100%, the fault is mine.
But if it only crashes 10%, then I think the fault is OOo.

sub TextBody
rem ----------------------------------------------------------------------
rem define variables
dim document   as object
dim dispatcher as object
rem ----------------------------------------------------------------------
rem get access to the document
document   = ThisComponent.CurrentController.Frame
dispatcher = createUnoService("com.sun.star.frame.DispatchHelper")

rem ----------------------------------------------------------------------
dim args1(1) as new com.sun.star.beans.PropertyValue
args1(0).Name = "Template"
args1(0).Value = "Text body"
args1(1).Name = "Family"
args1(1).Value = 2

dispatcher.executeDispatch(document, ".uno:StyleApply", "", 0, args1())


end sub