i got the same problem on Ubuntu Server with php 5.5.3.
but i think it is server related, cuz i didn't change anything and a few days ago i could open xls files on LibreOffice 4.3.0 and now i can't.
but i think it is server related, cuz i didn't change anything and a few days ago i could open xls files on LibreOffice 4.3.0 and now i can't.