What causes CodeFluent Entities to miss app.config settings on a deployed windows forms application? - codefluent

Question

I have some deployed windows forms applications that stopped working on a specific machine. A fresh reinstall redeploying all .exes and .dlls have no effect on resolving the error.
On the very first database access on the application, the error is such as:
Microsoft .NET Framework
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************** Texto de Exceção **************
System.Data.SqlClient.SqlException (0x80131904): Erro de rede ou específico à instância ao estabelecer conexão com o SQL Server. O servidor não foi encontrado ou não estava acessível. Verifique se o nome da instância está correto e se o SQL Server está configurado para permitir conexões remotas. (provider: Named Pipes Provider, error: 40 - Não foi possível abrir uma conexão com o SQL Server) ---> System.ComponentModel.Win32Exception (0x80004005): O sistema não pode encontrar o arquivo especificado
em System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
em System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
em System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFailover)
em System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover)
em System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout)
em System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance)
em System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions)
em System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
em System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)
em System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnectionOptions userOptions)
em System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnectionOptions userOptions)
em System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
em System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
em System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
em System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
em System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
em System.Data.SqlClient.SqlConnection.Open()
em CodeFluent.Runtime.CodeFluentPersistence.OpenConnection()
em CodeFluent.Runtime.CodeFluentPersistence.InternalExecuteReader(CommandBehavior behavior, Boolean firstTry)
em CodeFluent.Runtime.CodeFluentPersistence.ExecuteReader(CommandBehavior behavior)
em CodeFluent.Runtime.CodeFluentPersistence.ExecuteReader()
My app.config file has a
<configSections>
<section name="MyApp" type="CodeFluent.Runtime.CodeFluentConfigurationSectionHandler, CodeFluent.Runtime" />
</configSections>
and then a tag like:
<MyApp persistenceTypeName="MySQL"
I understand that this makes codefluent look for MySql.Data instead of the default System.Data (Sql Server)...
What may be causing this specific deployment of the winforms application on a specific machine, to be overriding that?
The key point on the error stack trace is:
em System.Data.SqlClient.SqlConnection.Open()
em CodeFluent.Runtime.CodeFluentPersistence.OpenConnection()
OpenConnection transitions to System.Data, instead of MySql....
What should I check on the Windows 7 OS of this machine that could cause such strange behavior, as opposed to other Windows 7 OS with the same application working just fine?