invisible brushes and can´t paint in bitmap layer

i just installed toon boom harmony 12 advanced and it seems there is a kind of glitch that doesn´t allow me to see the brushes size and textures, so i don´t know wich one im using.
also when i create a bitmap layer, i paint with the brush, but it appear invisible, because when i select what i just drew … it appears there is something there but i can´t see it … like invisible ink…

how can i repair it ?.. i´ve installed and uninstalled twice and the problem is still there …please help me

Can you post a screen or video capture of that issue? Have you checked if you haven’t accidentally activated the repaint brush (below, on the brush Tool Properties)? Did you try different colours? Can you draw on vector layers?

Luis Canau