White text in buttons?

[Roadsguy]

I noticed that the text in the button near the top of the Manage Templates window is white and completely invisible against the white background until I hover over the button. Here’s a screenshot of what I mean:

Anyone else have a similar problem? I’m running LibreOffice 5.1.3 on Ubuntu 16.04 with default settings aside from changing all the default fonts to Calibri, though I don’t see how that would affect this.

[Ratslinger]

I believe those are actually tabs as opposed to buttons. This is most likely an Ubuntu desktop setting which is the style chosen. I can sort of create the same appearance setting the style to High Contrast on xubuntu 16.04 using same LO.