how to get rid of fine line of a scribble shape

When I load your file, every shape or line I draw has the line in it.

When I create a new file, none of them do. I would suggest a corruption in your project, or if it is always present, in SL itself. If it is the former, you can hunt it down by starting a new project, and importing the old one slide by slide until you isolate the problem slide. If it is present on new projects, re-install SL.

the re-create the project from scratch is not necessary, it can be fixed

the problem is, that this strange border style is the default for all shapes

step 1: define a new default style for shapes

• open a new project, insert a new shape (e.g. a rectrangle)
  
  
• copy/paste it in your original project
  
  
• format the shape (fill color,  border color, ...)
  
  
  
  
  
• set "Set as Default Shape" (this is a misleading name for the function)
  
  
• result: all new shapes should have not this strange error

step 2: repare all shapes in the project

• copy the corrected style with "Format Painter"
  
  

• result
  
  
  
  
  i have the suspicion that the error is caused by an import from an external program (Powerpoint,  Illustrator,  ...)
  
  the error is then carried over from project to project, because the .story files are reused

I am not able to replicate that behavior using the Scribble shape. What steps did you use to create this? 

HI Ron.

I chose the scribble shape, then changed the outline color to RED and increased the line thickness to 5px.

here is a test file

Thanks a million for looking into it Walt!

Do you have a wild guess what made have caused it?
Is there anything I can do to prevent it from happening in the future?

I think it is a corruption in your project. You can hunt it down by starting a new project, and importing the old one slide by slide until you isolate the problem slide. If it continues to happen when you start new projects, re-install SL.

No idea what caused it. Maybe it is the way you held your mouth when you created the squiggle, or the way your cat was sitting, or a random quark flying through your hard drive. Whatever it was, if you can isolate the offending object, you can probably start fresh and it won't be on new projects. For the current project, you may be able to sort it out by importing a slide at a time, or you may have to re-create the project from scratch. If you start a new project and have the same problem, a reinstall is in order.

That solves the issue. You're the man! Thank you Juergen!

This "set as default & format paint" strategy also worked for another graphic issue of the same nature. Here is a link that shows a picture of a messed up slider thumb: https://community.articulate.com/discussions/articulate-storyline/slider-graphic-bug