Fout: path is null
  Bronbestand: resource://gre/modules/osfile/ospath_win.jsm
  Regel: 220

  Fout: downloadable font: kern: Too large subtable., table discarded (font-family: "Open Sans" style:normal weight:normal stretch:normal src index:1) source: https://mozorg.cdn.mozilla.net/media/fonts/OpenSans-Regular-webfont.2696e36f12c5.woff
  Bronbestand: https://mozorg.cdn.mozilla.net/media/css/thunderbird-start-bundle.f3f2a61e7492.css
  Regel: 1, Kolom: 1057
  Broncode:

Thunderbird recently upgraded to 38.1.0 Using only extension Lightning 4.0.1.2 (which, by the way, I find very useful...) Cannot move any received or sent mail to a local folder. * drag and drop does not work * right click mail to move mail to folder does not work Error console shows, amongst others, following error messages : * Tijdstempel: 13/08/2015 15:12:24 Fout: path is null Bronbestand: resource://gre/modules/osfile/ospath_win.jsm Regel: 220 * Tijdstempel: 13/08/2015 15:11:27 Fout: downloadable font: kern: Too large subtable., table discarded (font-family: "Open Sans" style:normal weight:normal stretch:normal src index:1) source: https://mozorg.cdn.mozilla.net/media/fonts/OpenSans-Regular-webfont.2696e36f12c5.woff Bronbestand: https://mozorg.cdn.mozilla.net/media/css/thunderbird-start-bundle.f3f2a61e7492.css Regel: 1, Kolom: 1057 Broncode: @font-face { font-family: "Open Sans"; font-style: normal; font-weight: normal; src: url("/media/fonts/OpenSans-Regular-webfont.83efe33660ab.eot?#iefix") format("embedded-opentype"), url("/media/fonts/OpenSans-Regular-webfont.2696e36f12c5.woff") format("woff"), url("/media/fonts/OpenSans-Regular-webfont.3cbf4d3ed22e.ttf") format("truetype"); }