diff --git a/EXE_GdbModifyCurve.cpp b/EXE_GdbModifyCurve.cpp
index 27933b1..f483892 100644
--- a/EXE_GdbModifyCurve.cpp
+++ b/EXE_GdbModifyCurve.cpp
@@ -154,7 +154,7 @@ ExeApproxCurve( int nId, int nApprType, double dLinTol)
    const double LIN_FEA_LEN_STD = 20 ;
    PtrOwner<ICurveComposite> pCC( CreateCurveComposite()) ;
    bOk = bOk && ! IsNull( pCC) ;
-   if ( nApprType == APP_LINES  ||
+   if ( nApprType == APP_LINES  ||  nApprType == APP_SPECIAL_LINES  ||
         nApprType == APP_LEFT_LINES  ||  nApprType == APP_LEFT_CONVEX_LINES  ||
         nApprType == APP_RIGHT_LINES  ||  nApprType == APP_RIGHT_CONVEX_LINES) {
       PolyLine PL ;
diff --git a/EXE_MachMgr.cpp b/EXE_MachMgr.cpp
index 7a18d97..5b2c167 100644
--- a/EXE_MachMgr.cpp
+++ b/EXE_MachMgr.cpp
@@ -1909,7 +1909,7 @@ int
 ExeGetBaseId( const string& sBase)
 {
    GseContext* pGseCtx = GetCurrGseContext() ;
-   VERIFY_CTX_MACHMGR( pGseCtx, false)
+   VERIFY_CTX_MACHMGR( pGseCtx, GDB_ID_NULL)
   // restituisco identificativo della base indicata nella macchina della macchinata corrente
    return pGseCtx->m_pMachMgr->GetBaseId( sBase) ;
 }
@@ -1919,7 +1919,7 @@ int
 ExeGetTableId( const string& sTable)
 {
    GseContext* pGseCtx = GetCurrGseContext() ;
-   VERIFY_CTX_MACHMGR( pGseCtx, false)
+   VERIFY_CTX_MACHMGR( pGseCtx, GDB_ID_NULL)
   // restituisco identificativo della tavola indicata nella macchina della macchinata corrente
    return pGseCtx->m_pMachMgr->GetTableId( sTable) ;
 }
@@ -1929,7 +1929,7 @@ int
 ExeGetAxisId( const string& sAxis)
 {
    GseContext* pGseCtx = GetCurrGseContext() ;
-   VERIFY_CTX_MACHMGR( pGseCtx, false)
+   VERIFY_CTX_MACHMGR( pGseCtx, GDB_ID_NULL)
   // restituisco identificativo dell'asse indicato nella macchina della macchinata corrente
    return pGseCtx->m_pMachMgr->GetAxisId( sAxis) ;
 }
@@ -1939,7 +1939,7 @@ int
 ExeGetHeadId( const string& sHead)
 {
    GseContext* pGseCtx = GetCurrGseContext() ;
-   VERIFY_CTX_MACHMGR( pGseCtx, false)
+   VERIFY_CTX_MACHMGR( pGseCtx, GDB_ID_NULL)
   // restituisco identificativo della testa indicata nella macchina della macchinata corrente
    return pGseCtx->m_pMachMgr->GetHeadId( sHead) ;
 }
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index 14beaa1..6900f61 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ