when I compiled the example given in an answer to post "Beamer presentation: List of frames within a section / part", I end up with
double numbering (with a shift) for frames except for the first one in the section. Like 
(source: free.fr)

Is there anything wrong with my beamer installation? Thank you for your help.
beamerinstallation up - to -date? I've used the TL 2015 (latest state before being frozen) on Linux – Apr 16 '16 at 16:113.07-1seems to be a little bit aged ;-) – Apr 16 '16 at 16:16