This is the first we've heard of this problem, so a bit of troubleshooting information would help.

First off, what operating system are you using?

Next, can you send a copy of the workspace as it sits when it causes problems (ie: save your workspace and send us the resultant file). Also, please send your MultiPing.ini file. Send these files to support@multiping.com and we'll have a look at them and then post back here.

Thanks,
Pete