Hey guys

So i have figured out a solution to both problems above however if anyone knows why they happened please let me know..

Here is the new prob... I have moved on to making the roof for my structure and while adding the geometry to the building split poly has gone crazy and wont allow me to cross the lines i have already layed. this is represented by the red lines in the diagram. I have already checked all the vertex are merged and that there are no more faces added under my other faces, no extra lines and i have also turned on and off snapping and other split poly features with no success. Gah this should be the easiest part !!!

Diagram as below: