Gimp leaving dots not lines.

[Lekituzl]

Gimp:  Using latest update.
Tablet:  Huion Graphic Tablet Model 420

When drawing a normal stroke with pen, it leaves dots about 60% of the time, not lines.  Makes it very impossible to draw.  My tablet works in other programs like Paint and Photoshop.  Any suggestions?

• I have uninstalled and reinstalled Gimp.
  
• Reset Huion tablet settings, checked pen sensitivity.
  

Any suggestions for me?  =/  I just got my new Huion pen and would love to draw!