Hi, and thanks for your answer.

Actually I solved the problem by starting with a plate and redimenson to the size I wanted. Previously I was starting with a cube.

But while working on a second room, I noticed I was offgrid and could not snap to it...that was weird as I use a 16 quants base for all dimensions...

As I was duplicating brushes..I thought " the problem can only come from here ".

So I went to WED preferences and marked the duplicate offset as zero for X and Y....

Duplicated one element...and voila..the duplicated element gets one or 2 pixel missaligned. If it is zero it should be exactly on the of the original...but that is not what is happening.

Does this happens to other people ? Is this a bug ? That is really weird...I cant create a level by designing every single element. I need to duplicate...and it needs to be precise.

Thanks once again

PS - SOLVED...SAVED THE LEVEL...EXITED WED..RELOAD LEVEL...NOW IT DUPLICATES OK.