Hello Bruno, thank you.
Maybe I'm using TDBAdvRichEditor/TAdvRichEditorMiniHTMLIO not in the right way:
I've placed a TDBAdvRichEditor on my form,
connect it with datasource/datafiled,
placed a TAdvRichEditorMiniHTMLIO on the form,
connect it to the above Editor by assigning the RichEditor property.
After saving/updating the dataset, I'm reading "MiniHTMLIO.AsString".
The datafield for richEditor ist defined as "blob".
Dumping the data it seems there are lots of control characters
like #$0B, #$0F, #$02, #$08, #$10 and #$00.
Unfortunately I have no idea which of the chars are valid and which are not.
But the representation of the text in the editor is always correct.
I know, you don't have to solve my problems, but what I can check next?