Index: sources/gui/qml/pages/posttreatment/PostTreatmentReview.qml
===================================================================
diff -u -r5e0731af5ae5e11d3981e4d3065a886975fb7fc3 -r465a935949a85d3d1bebd11979737ff38ef96122
--- sources/gui/qml/pages/posttreatment/PostTreatmentReview.qml	(.../PostTreatmentReview.qml)	(revision 5e0731af5ae5e11d3981e4d3065a886975fb7fc3)
+++ sources/gui/qml/pages/posttreatment/PostTreatmentReview.qml	(.../PostTreatmentReview.qml)	(revision 465a935949a85d3d1bebd11979737ff38ef96122)
@@ -47,7 +47,7 @@
         anchors.top     : _exportButton.top
         anchors.left    : _exportButton.right
         anchors.leftMargin: Variables.minVGap
-        enabled         : ! _GuiView.exportRunning
+        enabled         : _GuiView.usbIsReady && !_GuiView.exportRunning
     }
 
     ScrollBar {