Icon Labels Are Sometimes Missing

I noticed this problem first in the beta release, but it has persisted with the official 1.9.5.0 release. Some of the buttons in the command bar are missing text labels. They are not always this way, but I would estimate > 50% of the time when I start SourceTree, the icons appear shifted down slightly, which is probably hiding the text beneath a different part of the UI. This happens on multiple PCs, so it is not a single PC issue. It is also always the same 6 icons that have this problem.