Scintilla Weirds from a callback?

I'm trying to "correct" certain text as it is entered into a GtkScintilla widget under PHP-GTK 4.x/GTK 1.3. I've boiled it down to its irreducable minimum: for some reason, the Set_Text() inside the callback fails completely! I've tried update screen, hide()+show(), Select_All() + Cut(), and just about everything else I can think of. Any idea why this won't update the GtkScintillia Widget from inside the callback function? (but seems to, just fine, everywhere else!) Function UpdateTheText($widget) { $text=$widget->Get_Text(); Report("UpdateTheText($text)", 1); if ($text!=($newtext=str_replace('damn', '----', $text)) ) { $signal=$widget->Get_Data('signal'); $widget->Signal_Handler_Block($signal); $widget->Set_Text($newtext); $widget->Signal_Handler_Unblock($signal); } return true; } $n=DefaultScintilla(); $signal=$n->Connect('modified', 'UpdateTheText'); $n->Set_Data('signal', $signal); $w=&New GtkWindow(); $w->Add($n); $w->Show_All(); Any input would be GREATLY appreciated... -Ben -- "The best way to predict the future is to invent it." - XEROX PARC slogan, circa 1978