Template switch

The new template that has been here a few weeks just stopped working

Oddly, I just reinstalled that theme in its original form, with no changes by me, and it’s still displaying weirdly, with the right column appearing underneath the main column rather than next to it. I’m baffled.

WordPress/CSS gurus, can you figure out what’s happening?

I’ve switched to another theme. Code for the theme in question follows.

Curly braces taken out so it’s not interpreted as code, pound signs changed to $

$rap

background:#fff url(‘img/rap.jpg’) center repeat-y;
width:760px;
margin:0 auto;
padding:0px 8px;
text-align:left;
font-family: Trebuchet MS,Georgia, Arial, serif;
font-size: 0.9em;

$header
background:#fff url(‘img/pztop.jpg’) no-repeat bottom;
height: 183px;
margin: 0 auto;
width:760px;
padding:0;
border:#fc9 0px solid;

$main

margin:0 auto;
padding:0;
background:#000 url(‘img/content_bg.gif’) repeat;
width:740px;

$content
width:510px;
float:left;
padding:5px;
margin:0;
overflow:hidden;
display:inline;

$sidebar
width:186px;
float:right;
padding:0px 8px 10px 8px;
margin:0;
font-size:1em;
color:#333;
display:inline;