[Help]How to avoid the blue lines on screen?

Revit
1

Hi All:
In Revit, why do the blue lines occur after running Dynamo 1.1?
Is this a setup issue?
I beg yous expert assistance.
Thank you!

161218_Q1-1.jpg928×777 91.8 KB

2

From your image it seems like you got the Revit preview on?

3

Yeah, agreed with @jostein_olsen, just turn the background preview off for Revit Background.