Bold font not displaying

I have a problem with displaying bold fonts in few places. First time it happened couple months ago just after major update and now after a new update couple days ago. Right now it’s only happening in Virtual Desktop Bar widget and in Guake (in Konsole and Termite it looks as it should). No matter which font I choose, size, weight, it renders exactly the same, like there was no bold option but there is because when it’s needed some words (lines) display with bold.
Any thoughts?