when lpp=list("prBoundary" "boundary") ?
I mean, what's the cellView~>prBoundary supposed to do?
If you are using the IC61x release of virtuoso, the underlying database OpenAccess (OA) - this uses a prBoundary object to represent the place and router boundary, rather than a shape on a specific layer. The recent versions of Encounter operate on the OA database so they should understand the prBoundary object. I don't work with Encounter tools, so I'm not able to provide much more assistance on that topic, sorry.
Please state the versions that you are using and perhaps we can give better answers.