Detailed description of the issue:
Every dynamic point light creates beam of light to the middle of the map.
Length of the beam depends on the attenuation radius.
Spot lights still works properly.
There is no difference if floor is static mesh or BSP.
Okay, I’m glad that works for you. If you get more definitive steps to reproduce I would be interested in investigating further to prevent this from happening.
I have also encountered this problem and, just like Vaidas, creating a new map in the same project also solved the issue. If it reappears I’ll try to track down why.
I have been working on previous issues where there have been issues when rendering lighting with an Orthogonal Camera, for reference UE-11446. I have added the information found here into the report and will keep everyone informed as we work toward an issue.