In VeSTige instrument left and right arrows to browse presets are missing. Instead it shows something that looks like dead pixels. I remember that I was using these arrows about month ago on master branch.

This picture from Wiki shows how it used to look:

LMMS 1.2.0-rc2.144
(Linux x86_64, Qt 5.6.1, GCC 6.2.0 20161005)