blacklisted pc's, how to resolve?

I am seeing some errors of my pc's in my server logs that they are being blocked or unmanaged.  They are not showing up in the blacklist filter, but if I query sql directly they are in the agentblacklist table.  I do have a hierarchy and checked my other 2 NS servers and they don't exist there for other machines either.

here is the error I am seeing It appears they are happening about every couple minutes or so.

Attempt to save messaging resource 0654c50f-7a88-43dc-9a6b-5f7cf1564022 has been blocked by the Host Resource Blacklist.

Exception of type 'Altiris.NS.TaskManagement.TaskStoppedException' was thrown.
   [Altiris.NS.TaskManagement.TaskStoppedException @ ]