Is there a size limit on the query used in exec_sql.execute for 11g?

We have a library procedure that produces HTML output with a list of all the rows from a given journal table with a given primary key.  This procedure builds the query and uses exec_sql for executing the query.  This has been in our 9i forms for several years.  When we try to run this in an 11g environment, and the query is greater than about 2000 characters, it crashes the session.  Is there a parameter at the app server that needs to be modified to allow us to use queries greater than 2000 characters.  Both the 9i forms and the