Clock just halts for an hour when switching from daylight savings time

[ftkw]

On Ubuntu 13.10 using NTP I observed the clock to just freeze for one hour at 1:59 on 2013-10-27 (switch from daylight savings time to standard time) when instead it should run until 3:00 and switch back to 2:00 in that second. Unity's date and time settings window still shows the correct time.

GNU date also outputs the correct value, it seems to only affect the indicator.

[ftkw (ftkw)]

The following might be connected to this issue: When I booted the machine the following morning, the clock showed the correct time but was freezed from there on. As soon as I opened the settings and enabled "Show seconds", the clock was running correct again.