Further investigation reveals: everything is OK[*]Neither the annotations nor the 'private' keywords are gone! All data is still there.
[*]The first start of TP9 SP1 requested to open a database - and obviously I made an error in createing a new database - none of the thumbnails did exist and hence I had to create them anew.
[*]In this new data base - it was stored in the program folder and not in the main image folder - keywords were extracted from images (due to default settings). This gave me impression that my 'privately assigned' keywords had been removed. And of course in this new data base no Annotations could be present.
[*]Opening the database from the main image folder - the one I maintain - shows that all data still exist!
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So the whole issue is a 'user error'.
Thanks for listening