Sorry to hear that exporting has stopped working for you. Do I understand you correctly - everything works as before, but hitting Enter in the plan mode does nothing? I haven't changed anything there and I don't experience this issue. It is possible that your browser prevents "unauthorized downloading", then it means that some browser setting has been changed.
SVG export in 1PDG was requested more than once, so it will be implemented eventually if there won't be technical problems with that.