On my site http://www.position-relative.com everything was working fine. I'd made a number of changes to the theme's stylesheet, none major.
This morning I went in and added another class to the stylesheet, updated it and suddenly the layout was completely screwed. I removed my change, the layout remaine messed up.
I uploaded the theme's original stylesheet and it was back to normal (without my changes of course).
I tried to make one change (a padding size) and once again the layout was destroyed.
If I make (or attempt to undo) *any* changes to this stylesheet whatsoever the layout is trashed - I mean elements are all over the page. This was not happening until this morning - any advice greatly welcome!