Starting with Market version 3.5, there is a potential layout issue if you use a really wide logo on your site.  It's possible that the search box will overlap your logo, and potentially make your website look less than perfect.
 
If you do use a really wide logo that stretches into the search bar area, then you'll need to make one change in the stylesheet to fix this.

In the stylesheet, scroll down until you find the element class

#bar .sdl .topsearchbar

Within that class, replace the line"

position:absolute;

with

/*position:absolute;*/

and Save the file.

That should do it.

If you ever switch to a smaller logo width, simpy revert back to the original stylesheet code (take out the "/*" and "*/") and save the file.