André Offringa <of**@gm**.com> reported this problem on the Debian tracker:

"I am running ntpdate on my laptop, and when I have worked some time without
Internet, my system time might be quite rigurously changed by ntpdate. If
this happens, Workrave continuous to work correctly, and pops up the next
micro break correctly: the timer starts to count down to 0. However, once it
has reached 0, the micro break window does not dissapear, leaving my computer
in a frozen state, as I can not type or close windows either. I have also
seen the counter jumping to a very high value, e.g. two hours to count down,
but that happens less often."

I'm not sure exactly what the problem he's describing is about, so feel free to ask for clarifications, I'll relay your comments over to him.

Cheers,
Francois

*** This bug has been marked as a duplicate of bug 744 ***