For all amule versions:
In the graphs in the statistics tab, there is a problem when the system time is changed (the mean speed are "miscalculated").
Even if system time is not supposed to be changed often, in my case, it is :
my system time is synchronized with a NTP (Network Time Protocol) server every 5 minutes.
I suggest the code to be based on the uptime (for UNIX systems), instead of the system date.
Keep your good work. And may the power be with amule
