Autocad LT 2015 shows lines going everywhere on drawings

[mizzlefizzle87]

 Hello - 
 My company just purchased autocad LT 2015 and we open up our drawings they show up with lines going every which way. Computer #1 that we installed it on works fine but now every other computer we install it on shows lines going every where. I added a screenshot of the working drawing and also the one that has the lines.

[pendean]

LT2015 have an all new graphics engine: perhaps PC #1 meets the new requirements and others do not? Change hardware acceleration settings on the problem PCs and turn off LINESMOOTHING variable and see if these help.

[S-Fearon]

Same problem here.  LINESMOOTHING off worked.

[detroit808]

Line smoothing is functional only in 2D Wireframe according to the Help system, so why does this problem occur also in the 3D visual styles X-Ray and Realistic with two vertical viewports?