Hot on the heels of the recent releases of AutoCAD P&ID 2013 and AutoCAD Plant 3D 2013 are a couple of hotfixes.
For AutoCAD Plant 3D 2013, the following hotfix is available:
AutoCAD Plant 3D 2013 Off-Page Connector Hotfix
Off-Page Connectors
If a P&ID drawing is removed from a project and then added again, you cannot reconnect the off-page connectors.
For AutoCAD P&ID 2013, the following hotfixes are available:
AutoCAD P&ID 2013 Off-Page Connector and SQL Server Hotfix
SQL Server
An AutoCAD P&ID 2012 project using an SQL Server database and SQL Server Authentication cannot migrate to AutoCAD P&ID 2013. An SQL Server using Windows Authentication is not affected by this issue.
Off-Page Connectors
If a P&ID drawing is removed from a project and then added again, you cannot reconnect the off-page connectors.