Thanks, I’ll try it 4.13 again (got all mixed up between versions already :o ).
I strongly disagree about content issues in this particular case. I am using Infinity Blade assets and kitbashing technique for level design. That should work out of the box, but it doesn’t (which also looks like it doesn’t work for you in 4.12 either judging by the screenshot on the left). Several folks on Unreal Slackers confirmed that they had the same issue and the only fix was to model rooms with floors perfectly fitting inside the walls.
One of the UE3/UDK strong points was ability to build levels using kitbashing, which isn’t always correct solution, but fastest and fast is essential for indies. If UE4 isn’t designed to allow such freedom, it should be noted somewhere clearly (preferably in the Skylight section of the docs, since like I stated before I have no issues when not using Skylight).