Problem using Libreoffice calc with Ubuntu 14.04

[Jim Byrnes]

Running Ubuntu 14.04, Libreoffice 4.2.8.2

The problem I am seeing is when I change the bottom border of a cell to 
a double underline, I see a thick black line, not two individual lines.

I have discussed the problem on the Libreoffice forum and they seem to 
think it is a display problem, but I'm not so sure. One person said his 
OS and LO were the same as mine and he could see the double underlines.

I made the following observations:

Desktop computer running Ubuntu 14.04 + LO 4.xx = black line.

Laptop running Ubuntu 14.04 + LO 4.xx = black line.

Same laptop running Mint 17 + LO 5.xx = a double underline.

A sheet created on the desktop with LO 4.xx opened on the laptop
   using  Mint 17 and LO 5.xx = black line.

Desktop reverting to Ubuntu 12.04 + LO 3xx = black line.

I have a copy of Gnumeric on my 12.04 partition and it will display the 
bottom border of a cell as a double underline just fine.

If I print the sheet on 14.04 + LO 4.xx I see the double underline.

To me some things point to a display problem and other seem to point to 
a settings problem. What are your thoughts?

Regards,  Jim