After machine waking up from sleep the CPU history chart stays empty

[whimboo]

I noticed today that the CPU history graph stays empty when the machine was in sleep mode for a longer period of time. When I select other processes the output will be there until the next time a process info update happens. Then it's empty again.

[whimboo]

Actually this might also be related to a 2nd open browser window. When I switch to that window, which was minimized before, the output works again.