This happens when Ping Plotter is trying to create a timer - and the Windows API call to create that timer fails. Timers are used for a few things - including doing the next sample (based on the trace interval), auto-saving (images and data), alerts, and a few other misc. functions.<br><br>I've never seen this - or heard of anyone reporting this. What version are you running, and when does this happen? Is it reproducible?<br><br>