Version:            (using KDE 4.4.0)
OS:                Linux
Installed from:    Ubuntu Packages

When you resume from suspend, the clock in the panel will be showing a false time(the time when the computer suspended) until system time reaches a new minute. Unless it displays seconds.
I guess this is because the clock only subscribes on minute-updates, and the dataEngine does not realise that the plasmoid should be told the time if the system is resumed (the date/hour/minute number is changed unexpectedly, e.g. at second 33).