Comment 2 for bug 1561207

Hmmmmmmmmmm.... OK, so I don't think this is a Terminator bug, though there is a way to "fix" it. I'll try and explain why.

Terminator is a Python program wrapped around the C based libvte terminal widget that is used by many, many terminal emulators, though not Konsole. Konsole uses completely different technologies.
Libvte is built on/for gtk libraries.
Gtk libraries use the libpango font renderer.

The default Terminator (and libvte) is based on gtk2 libraries. Another terminal app Guake is also gtk2 and also displays the strangeness in the vertical bars.

It is not clear if this strangeness is happening within the libvte widget, or the libpango font renderering, but it'll be one of those two.

Gnome Terminal is based on gtk3, which in turn has updated libvte and libpango, and it *doesn't* display this strangeness. So the problem is the old base libraries of default Terminator.

We do have an essentially complete, stable port to gtk3 which "fixes" the issue. It is typically a little more involved to get and install though. See this page if you want to give it a try:
http://gnometerminator.blogspot.de/2015/09/so-you-want-to-try-terminator-gtk3.html

I'll mark this as Fix Committed (just not released.)