Ping not working

I have a list of IPs in column A. I click on the first IP and then click Ping and nothing happens..it used to work. Same with NsLookup

I have the same issue. I tried uninstalling and reinstalling the plugin, and get an "unhandled exception" error.

Since the demo sheet works I guess that the settings changed.   Apparently MS can do this when patches are applied, sometimes on even number days that start with letter “T.”

Problem is likely that you have no output destinations set for ping / nslookup.

Go to - Config Settings – Settings and Options – Output and Display  - Each Ping.  
There are many settings under Output and Display.