We just finished fixing a problem with our Horizontal Scrolled layout. It was not showing the correct layout when viewed using some web browsers but this has now been corrected.
If you are interested in what went wrong, you have to know some of the details behind how that layout operates.
Horizontal Scrolled layout uses some newer, more complex technologies that only work reliably on newer versions of most web browsers. In this case, Internet Explorer version 6 or greater, Safari version 4 or greater, and Firefox version 1.5 or greater as well as a bunch of other, lesser known web browsers. Only about 1% of visitors to ArtSites websites use a web browser that does not fit this concept of a "modern web browser" so we are fairly safe in using these technologies for our administration system.
We know that there are some people out there still using computers that are 8 or more years old that might have web browsers that don't meet these requirements. To make sure that these people don't get left behind, we identify the web browser and if it doesn't meet our standard of "modern", we revert the view of the website back to the Tiled layout, but only for that visitor. So while the visitor won't see the website in exactly the way that the artist wanted them to see it, at least they can see it and likely wouldn't even know there was a problem.
The nature of this particular bug is that some modern web browsers that should have seen the new layout were being shown the old layout.