Hi, Mikey.

What you're seeing usually results from ICMP TTL expired packets being blocked by a firewall / similar. Make sure your desktop and laptop are sending / receiving through the same gateway on your network - if you're connecting through a different firewall, one may be blocking these and the other not.

I'm not a regular user of any of the 3 applications you listed. The most likely problem would be if any of them act as a firewall.

In 2.40, there shouldn't be any DLL conflicts - as it doesn't install any .DLLs. You can test your basic networking by going to a command line and testing the TRACERT application. If you're getting good results with TRACERT but not Ping Plotter (a situation that has happened maybe 2 times in the history of Ping Plotter, and is extremely unlikely), then we may have some issue that is local software related. Otherwise, it's likely to be a network issue of some kind (network firewall on your machine, or further out that is different from the workstation that works).

Post back here what you find with TRACERT and after you've verified the network similarities between your laptop/desktop, and also after you've checked for firewalls and disabled them (temporarily) on your machine and tried it again. If that doesn't point to the problem, then we'll keep digging.

- Pete