UPDATE 2016.0624
I just updated LO on my Linux machine to Version 5.1.4.2. I tested both of the issues reported earlier concerning the Windows edition of LO Calc, Version 5.1.3. The Linux edition tested fine, so these issues are specific to Windows LO 5.1.3.
I will report my findings via Bugzilla.
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I just commented on another post at Input line in calc not legible, but I’ve decided to start a new post based on what I’m finding.
I’m running LO 5.x (see below) on a Windows 7 machine.
Finding 1
After downloading and installing LO 5.1.3, the LO Calc input line displays an unprintable character symbol (the black rectangle) for the number 1. You can actually see the number 1 in the corresponding spreadsheet cell.
I rebooted my computer and the problem was still there. I uninstalled LO 5.1.3 and reinstalled LO 5.1.2. The problem disappeared.
Finding 2
Before uninstalling LO 5.1.3, I noticed a gap between the letters “w” and “r” in the word “rewritten.” When I reinstalled LO 5.1.2, I found the gap was still there.
Some experimenting seems to indicate this kerning issue only exists with certain fonts. In fact, I have only found two fonts so far that exhibit this problem: Arial and Liberation Sans.
Both of these issues appear to me to be bugs. Has anyone else encountered either of these problems?