After you've used the text tool, adding as many text as you want, the canvas freezes (not the GUI though, the zoom sliders and etc work fine)and is unusable. You can't draw, pan, zoom in or out, nothing. The cursor is also invisible in the canvas. The artistic text editor is quite unpredictable, because under certain parameters it allowed to edit the text, but in some other tries it didn't. The bug can only be resolved by reopening krita, and desaving OpenGL doesn't work.