I can confirm that I experienced same problem in Lenovo i5 with 8GB RAM, running with up-to-date Ubuntu 16.04.01 using LibreOffice 5.1.4.2 10m0(Build:2). The problem was solved after remove libreoffice-gtk* as @mcnichol suggested.
I can confirm that I experienced same problem in Lenovo i5 with 8GB RAM, running with up-to-date Ubuntu 16.04.01 using LibreOffice 5.1.4.2 10m0(Build:2). The problem was solved after remove libreoffice-gtk* as @mcnichol suggested.