Brush and pencil lines appear only after releasing mousse

Good day,

Im using ToonBoom animate pro 2 and when im trying to draw, the lines only appear when i release my mousse. Any idea what could be causing this?

I’m using the camera view, but in the drawing view this also happens.

I have a brand new computer with a NVIDIA graphics card.

Which Nvidia care are you using?
Have you updated the video card driver to latest?
Which tablet are you using?
make sure uncheck ‘Brush size cursor’ off in Preferences>Drawing tab and turn of any option of anti-aliasing (both) in Preferences>OpenGL tab for the test. And try drawing a solid pencil line on new scene.