Index: /trunk/src/VBox/Frontends/VirtualBox/src/settings/machine/UIMachineSettingsSystem.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/settings/machine/UIMachineSettingsSystem.cpp	(revision 58827)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/settings/machine/UIMachineSettingsSystem.cpp	(revision 58828)
@@ -187,5 +187,10 @@
     int iParavirtProviderPosition = m_pComboParavirtProvider->findData(systemData.m_paravirtProvider);
     m_pComboParavirtProvider->setCurrentIndex(iParavirtProviderPosition == -1 ? 0 : iParavirtProviderPosition);
+    /* Force 'VT-x/AMD-V' checkbox-button to be enabled by default as it is always used/enabled on Mac OS X: */
+#ifdef Q_WS_MAC
+    m_pCheckBoxVirtualization->setChecked(true);
+#else /* !Q_WS_MAC */
     m_pCheckBoxVirtualization->setChecked(systemData.m_fEnabledHwVirtEx);
+#endif /* !Q_WS_MAC */
     m_pCheckBoxNestedPaging->setChecked(systemData.m_fEnabledNestedPaging);