diff --git a/EgtGeneral.rc b/EgtGeneral.rc
index ee67c92..ae4f2d8 100644
Binary files a/EgtGeneral.rc and b/EgtGeneral.rc differ
diff --git a/LuaManager.cpp b/LuaManager.cpp
index 9b2c1af..a1ba4cb 100644
--- a/LuaManager.cpp
+++ b/LuaManager.cpp
@@ -157,7 +157,9 @@ LuaMgr::EvalExpr( const string& sExpr, double& dVal)
   // completo la stringa da valutare
    string sEval = "return " + sExpr ;
   // valuto l'espressione
-   int nErr = luaL_loadstring( m_pL, sEval.c_str())  ||  lua_pcall( m_pL, 0, 1, 0) ;
+   int nErr = luaL_loadstring( m_pL, sEval.c_str()) ;
+   if ( nErr == LUA_OK)
+      nErr = lua_pcall( m_pL, 0, 1, 0) ;
   // senza errori
    if ( nErr == LUA_OK  &&  lua_type( m_pL, -1) == LUA_TNUMBER) {
       dVal = lua_tonumber( m_pL, -1) ;
@@ -195,7 +197,9 @@ LuaMgr::EvalExpr( const string& sExpr, string& sVal)
   // completo la stringa da valutare
    string sEval = "return " + sExpr ;
   // valuto l'espressione
-   int nErr = luaL_loadstring( m_pL, sEval.c_str())  ||  lua_pcall( m_pL, 0, 1, 0) ;
+   int nErr = luaL_loadstring( m_pL, sEval.c_str()) ;
+   if ( nErr == LUA_OK)
+      lua_pcall( m_pL, 0, 1, 0) ;
   // senza errori
    if ( nErr == LUA_OK  &&  lua_type( m_pL, -1) == LUA_TSTRING) {
       sVal = lua_tostring( m_pL, -1) ;
@@ -223,7 +227,9 @@ LuaMgr::ExecLine( const string& sLine)
    if ( m_pL == nullptr)
       return false ;
   // eseguo la linea
-   int nErr = luaL_loadstring( m_pL, sLine.c_str())  ||  lua_pcall( m_pL, 0, LUA_MULTRET, 0) ;
+   int nErr = luaL_loadstring( m_pL, sLine.c_str()) ;
+   if ( nErr == LUA_OK)
+      lua_pcall( m_pL, 0, LUA_MULTRET, 0) ;
   // senza errori
    if ( nErr == LUA_OK) {
       m_sLastError.clear() ;
@@ -249,7 +255,9 @@ LuaMgr::ExecFile( const string& sFile)
    if ( m_pL == nullptr)
       return false ;
   // eseguo la linea
-   int nErr = luaL_loadfile( m_pL, sFile.c_str())  ||  lua_pcall( m_pL, 0, LUA_MULTRET, 0) ;
+   int nErr = luaL_loadfile( m_pL, sFile.c_str()) ;
+   if ( nErr == LUA_OK)
+      lua_pcall( m_pL, 0, LUA_MULTRET, 0) ;
   // senza errori
    if ( nErr == LUA_OK) {
       m_sLastError.clear() ;