Can't export (Please select some values)

Sorry but I’m unable to replicate this. Even if I don’t select any conent blocks before clicking on Export Selected I don’t get a white page – it should popup with a message saying, “Select at least one block to export”.

Could it be a conflict with another plugin? I guess the only way to find out is to disable all other plugins and see if it works. If so then re-activate them one at a time until you find the culprit.