There is some hope... I've put my code in a new test environment, and
it does not issue "SET NO_BROWSETABLE ON". I've debugged the situation
further, and found some interesting differences doing some networking
debugging (using Wireshark):

-When I connect in the production environment, the one that gets "SET
NO_BROWSETABLE ON", the "App Name" is set to "Microsoft (R) .Net
Framework" and "Library Name" is set to OLEDB
-When I connect in the testing environment, both "App Name" and
"Library Name" are set to ".Net SqlClient Data Provider".

The "App Name" that appears in Wireshark is the same that appears in
SQL Profiler.

An adapted code example follows:
-----------------------------------------
Dim SQLConx As SqlConnection = New SqlConnection
Dim SQLCom As SqlCommand = New SqlCommand
Dim SQLDR As SqlDataReader

Try
SQLCom.Connection = SQLConx
SQLCom.CommandType = System.Data.CommandType.StoredProcedure
SQLCom.CommandText = "myStoredProcedure"
SQLCom.Parameters.Add("@param", _param)
SQLConx.ConnectionString = SQLConnectionString
SQLConx.Open()
SQLDR = SQLCom.ExecuteReader()
SQLConx.Close()
Catch exc As Exception
-----------------------------------------

What's stranger is the OLEDB reference. I'm not using it in my code,
but it appears in the network trace. What might I be missing?

rj