Animate Pro Lines not appearing!

When i go to draw lines they disappear while im drawing! only appearing as i let go

it appears to be a problem with TBS but the fix does not apply
the TBS forum posting is here https://forums.toonboom.com/toon-boom-studio/general-discussion/cant-see-line-as-i-draw
i get exactly the same problem!

anyone have any idea how to fix this? thank you!

Please update the display-card drivers.
and try again.