I am on OS X El-Capitan and when trying the new version I get the lense flare of hidden spot lights showing up across physical objects (such as walls) in preview as well as in final renders see attached render (see top right part of the image). Hope this gets fixed in the next update!
More tests to highlight the issue:
the same render in Artlantis 5 and in Artlantis 6 (latest release)!
The version 5 render is OK with regard to the lense flare display but the version 6 one clearly shows the lense flares of the hidden spot lights of the corridor!
V5 render:
V6 render:
Simple solution, don’t use lens flare, it sucks anyway. Do it in Photoshop.
Thanks for the reply, your solution is interesting for a few stills but isn’t practical when you’re doing tens of them or when you’re doing animations!
Hello Tariq,
Thanks for posting this bug.
I have tested with earlier versions of Artlantis and the bug is already present, so it is not a 6.5.2.14 issue !
I have entered a bug in our data base and we will fix it for the next release, in the meantime, uncheck the lens flare option if the spot is hidden.
Best regards,
Many thanks for your response Camille, I hope that the new update will not take so long to show up!
Keep up the good work,
T
This bug still hasn’t been fixed in version 7!!!
No, sorry, it has not been fixed yet, but we should work on it for the next release.
Hope, it’s not gonna be called Artlantis 8 !!! 
Actually, version 7 should’ve come out with its own set of shaders perfectly calibrated for the new engine and not rely on the v5 settings as v6 did!!!