Please check if "Simplified Monitoring" is checked on the particular node
(Right click on the node, select Monitoring->Properties).
When "Simplified Monitoring" is enabled then NetCrunch will not collect any performance data and there will be nothing displayed on a chart.
If the chart was created based on OS counter (Windows, Linux, BSD, Mac OS X), make sure that NetCrunch is successfully logged in to the monitored machine.
