Hi all, sorry for the confusion but I finally found the reason for my problem.
I set the variable "org-time-stamp-rounding-minutes" in my .emacs correctly but unfortunately I didn't recognize the same variable in "custom-set-variables" section. :( @Bastien: In the meantime I installed the actual version "Org-mode version 6.28e" Thanks a lot for all your efforts. Kind regards, Frank PS: At least I learned some aspects of lisp debugging. :)
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