Hot fix contains:
New: Polyline.Path property returns GraphicsPath for a polyline. Creating polylines and set{} little delayed. We didn’t finish testing yet.
Fixed: Fonts.GetEnumerator() returns IDictionaryEnumerator now.
Changed: Changed type of all FontIndex properties to int.
Fixed: Recognizing ole objects. It was broken in 2.5.1 hot fix.
Fixed: Slide.AddNotes() method call could hang application thread or make presentation broken.
Fixed: After restoring of serialized shape TextFrame property always was null.