I wonder if someone could explai to me why this situation is happening :

1 - Create a room using an Hollwow Cube (or create a cube and then hollow it)
2 - Compile with default texture...

No problem

But

1 - Create a room with 6 indepent walls floor and ceiling (I create a brush, and then copy it and move it to the correct places.
2 - Compile with default textures

I get region leaking

But there are no leaks..Everything is perfectly grid aligned as in the automatic hollowed cube.

I use this technique in hammer, and never had any problem, and my workflow is to create the levels using small brushes insted of hollowing things...But I'm getting this error.

If someone knows why..I would appreciate.

Its got nothing to do with skyboxes...I eve tryed to put an hollowed cube around but the same problem arises.