We currrently use only TWPRichText. We save ans load RTF text from a stream. This works perfect for us.
Recently I put a TWPRichTextLabel onto our MainForm. And in some cases our software reports an exception : EClassNotFound : Class TWPRichTextLabel not found.
We don´t have done anything with the TWPRichTextLabel! Only the label was on our form - nothing else was done with it.