The publisher is running SQL Server 2008 R2 on a Server 2008 R2 box. The subscriber is running SQL Server 2012 on a Server 2012 box. I have tried launching the replication monitor from both servers but can't drill down into details on either instance. I have three publications and subscriptions and they all throw this error when trying to drill down into the details. I would post a picture but am unable to do so.
Here are the error details
===================================Replication Monitor could not open the Detail Window. (Replication Monitor)
===================================
Specified cast is not valid. (ReplicationMonitor)
------------------------------
Program Location:
at Microsoft.SqlServer.Management.UI.PublicationDetailControl.ShowSubscriptionDetailWindow(Int64 rowIdx)