I run into this occasionally, I think in last 3-4 years being SQL Server PFE, I have seen this issue total of 4 times. So
Category: SQL Failover Cluster
SQL Server Integration Services Issue (Failed to retrieve data for this request. (Microsoft.SqlServer.SmoEnum))
TITLE: Microsoft SQL Server Management Studio —————————— Failed to retrieve data for this request. (Microsoft.SqlServer.SmoEnum) For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&LinkId=20476 —————————— ADDITIONAL INFORMATION: The SQL server