There may be long delay when running "show running all" commands on stacked devices.
The scanner will presently only wait a few dozen seconds for a command to start issuing output before it gives up and moves on to the next command in a list of commands to be tried. Some device configurations (and stacks of devices) can take several seconds, to several minutes, in order to produce the output for 'show running-config'.
As a work around , please click on I'm having problems scanning stack member devices for more information.
Another suggestion is to increase the Command Timeout in Settings menu before scanning the devices.