Toon Boom Animate - mouse line drawing problem

Hi I have a question about drawing in Toon Boom. My mouse does not seem to draw the line appears after I have finished drawing it that makes drawing really dificult. I have tried to find the settings to fix this problem but do not know where to look for them.

I also have a tablet and when I use the pen an even stranger thing occurs. I sometimes drawnormally (line following the cursor) and sometimes the same thing occurs (line appearing after the completion of the line). I cant figure out what makes the difference.

Could someone tell me where to look for a solution?

Thank you.

What Operating system are you using?

If you are on Windows, you can try changing the renderer type in the Display tab of the preferences and then restarting the software.