Since moving to Unity 5 my line renderer has started flickering in the Editor, and in the game it just shows up black (it has an emissive shader & is set to white). It doesn’t seem to be an issue on my developers machine. My graphics card is up to date. Any ideas what could be causing it?
Today i have upgraded from Unity 5.0.0f4 to Unity 5.0.1f1 and now i got the same issue. In version 5.0.0f4 the line renderer worked fine. Didn’t change anything in the project. Seems like a bug in the new version.
Bug report submitted
Case 692732
I am having the same problem. I went through the survival shooter tutorial, when I got to part 7: Harming enemies and added the line renderer and then added the material from the project to it, the scene view would display black and flash yellow (I think that’s supposed to be the material color) but it’s hard to tell and then playing the game the line drawn would be black. I’ve tried removing and re-adding it. Changing settings and nothing works. Though, if no material is applied. It draws the default magenta color without flashing. I’ve tried changing materials, and that just changes the line to flash based on the material color.
Vote on the bug report
I too have this, I’ve voted on the bug report. Can we get this fixed please Unity it’s ruining my fishing game. 
Case number i voted on was: 681910
Has this been fixed in 5.1?
Just upgraded to 5.1, I’m still seeing the same issue
That’s not good. 
Problem still very much present in 5.1.0f3
Still seeing this on 5.1.1f1
Its their shader that’s the problem near as I can tell… They expect us to go and vote on if they should do their job on the bottom of some bug report.
The best you can do is use an unlit legacy shader… that flickers ‘less’.
Same issue here.
Using an unlit shader removes the flickering effect.