CMS CMS parsing issues
 

Up until yesterday, my CMS pages were displaying correctly as defined in the Layout Manager (2 Column + Sidebar (25%, 75%, 240px)

Now, all of the widgets/articles are appearing on each page one on top of the other as if the parsing of the layout manager is being ignored. What used to be widgets on the left, articles in the middle and widgets on the right, is now being displayed one underneath each other on the entire page. Layouts are totally ignored. This has also caused pictures that were included in the articles(thumbnailed or reduced sizes) to now display in full size.
Where should I start to try and fix this and what could have caused this?