Index: sources/gui/qml/components/USBButton.qml
===================================================================
diff -u -r27cc308ff5113a9386899d3c8f8b29962a8498e1 -r86e9dfbff50cb7e16fd94c16c1c818cef3b47eac
--- sources/gui/qml/components/USBButton.qml	(.../USBButton.qml)	(revision 27cc308ff5113a9386899d3c8f8b29962a8498e1)
+++ sources/gui/qml/components/USBButton.qml	(.../USBButton.qml)	(revision 86e9dfbff50cb7e16fd94c16c1c818cef3b47eac)
@@ -35,9 +35,10 @@
         _GuiView.doUSBDriveUmount()
     }
 
-    fading: ! _GuiView.usbReady && ! _GuiView.usbRemoved
+    fading: ! _GuiView.usbIsReady && ! _GuiView.usbIsRemoved
 
     Connections { target: _GuiView
+        onDidUSBDriveUmount : _root.enabled = false
         onDidUSBDriveRemove : _root.enabled = false
         onDidUSBDriveMount  : _root.enabled = true
         onDidExportLog      : _root.enabled = false