wordpress.com ping issues

We transferred our blog over to our own server. we are pining ping-o -matic. none of our post our new posts are searchable at wordpress.com we have ping-o-matic listed our list of places to ping. I read about issues with the word press pinging service. we are now using the MaxBlogPress Ping Optimizer plug-in. We are still not showing up on wordpress.com. Are there any other issues that may cause this problem? or is wordpress.com still using ping-o-matic to receive pings? The blog went live about 1 week ago until then we had been using a wordpress blog at wordpress.com

Thanks for your help!