Can't add line breaks to Wordpress posts

I can't seem to add new line breaks to my Wordpress posts, even by using the following:

<br />
<p> </p>
&nbsp;

Code (markup):

Wordpress just squishes them all into nothing! Is there something in the CSS, maybe, that's making it impossible to add blank lines?

My CSS:

/*  
Theme Name: Big Blue modified
Theme URI: http://www.blogohblog.com/
Description: Big Blue is a 3 columns Wordpress theme. I love to hear of my work being used :). This work is licensed under a <a href="http://creativecommons.org/licenses/by-sa/3.0/">Creative Commons Attribution-Share Alike 3.0 License</a>. This means you may use it for any purpose, and make any changes you like. Just leave my Bob link under your footer :)
Version: 0.1. Modified by lukeprog for lukeprog.com
Author: Bob 
Author URI: http://www.blogohblog.com/

This theme was designed and built by Bob of <a href="http://www.blogohblog.com/">Blog Oh Blog</a> based on the famous <a href="http://binarybonsai.com/kubrick/">Kubrick</a>.
*/

body{font-family:Verdana, Arial, Helvetica, sans-serif;font-size:12px;background-color:#fff;background-image:url(images/topbck.gif);background-repeat:repeat-x;color:#666;margin:0;padding:0;}
#wrap{width:980px;margin:0 auto;padding:0;}
#top{height:69px;width:980px;clear:both;margin:0 auto;padding:0;}
h2,h3{font-size:16px;font-weight:700;margin:0;padding:0;}
#main{width:980px;margin:10px auto;padding:0;}
#header{width:400px;height:69px;float:left;margin:0;padding:0;}
#header h1.blogtitle{font-family:Arial, Helvetica, sans-serif;color:#fff;margin:0;padding:10px 0 0;}
#header p.desc{font-family:Verdana, Arial, Helvetica, sans-serif;color:#fff;font-size:11px;margin:0;padding:0;}
#nav{height:69px;float:right;width:550px;margin:0;padding:0;}
ul.nav{height:69px;line-height:69px;float:right;list-style:none;font-size:11px;text-transform:uppercase;margin:0;padding:0;}
ul.nav li{float:left !important;list-style-type:none;margin:0;padding:0;}
ul.nav li a,ul.nav li a:link,ul.nav li a:visited{background:#356aa0;color:#fff;float:left;display:block;text-decoration:none;padding:0 10px;}
ul.nav li a:hover,ul.nav li a:active{background:#fff;color:#205387;text-decoration:none;}
ul.nav li.current_page_item a{text-decoration:none;background:#39c;color:#000;}
ul.nav li ul{float:left;margin:0;padding:0;}
#content{width:510px;float:left;margin:0;padding:20px 0 0;}
.entry{font-size:11px;float:left;width:500px;text-align:justify;margin:0;padding:0 0 20px;}
#sidebar{float:right;width:450px;margin:0;padding:20px 0 0;}
.rsidebar{float:right;width:230px;margin:0;padding:0; overflow:hidden;}
.rsidebar h2{background:url(images/h2c.gif) no-repeat;height:22px;font-size:13px;font-weight:700;color:#6995c2;margin:0;padding:0 0 10px 8px;}
.postmetadata{background:#eee;border-bottom:1px #ccc solid;border-top:1px #eee solid;font-size:10px;margin:0;padding:5px;}
.boxcomments{border-top:5px solid #ddd;border-bottom:5px solid #ddd;margin-bottom:20px;width:510px;}
#commentform{border-top:1px solid #eee;margin:0;padding:15px 15px 1px;}
#commentform label{display:block;margin:0;}
#commentform input{width:170px;margin:0 5px 10px 0;padding:1px;}
#commentform textarea{width:400px;margin:0 0 10px;padding:0;}
#commentform #submit{margin:0 0 20px;}
#commentform p{margin:5px 0;}
ol.commentlist{margin:0 0 1px;padding:0;}
ol.commentlist :hover{background:url(images/latestbck.gif) repeat-x;}
ol.commentlist li{border-top:1px solid #eee;display:block;list-style:none;margin:0;padding:15px 15px 1px;}
ol.commentlist li :hover{background:none;}
ol.commentlist li.commenthead{display:block;list-style:none;margin:0;padding:5px 15px;}
ol.commentlist li.commenthead h2{margin:0;}
ol.tblist{border-top:1px solid #fff;list-style:none;margin:0 0 1px;padding:15px;}
ol.tblist li{display:block;list-style:none;background:transparent url(images/c.gif) 0 2px no-repeat;padding-left:15px;margin:0 0 5px;}
#eof{width:980px;clear:both;height:20px;background:#fff;margin:0 auto;padding:0;}
.navigation{width:500px;float:left;color:#666;}
.alignright{float:right;margin-top:10px;}
.alignleft{float:left;margin-top:10px;}
#footer{background:url(images/footerbck.gif) repeat-x;height:31px;line-height:31px;clear:both;}
.footer{width:980px;text-align:left;font-size:11px;margin:0 auto;}
.lsidebar{float:left;width:200px;margin:0;padding:0;}
.lsidebar h2{background:url(images/h2.gif) no-repeat;height:22px;font-size:13px;font-weight:700;color:#6995c2;margin:0;padding:0 0 10px 8px;}
a:link,a:active,a:visited,a:hover{text-decoration:none;color:#356aa0;border:none;}
#header h1 a:link,#header h1 a:active,#header h1 a:visited,#header h1 a:hover{text-decoration:none;color:#fff;border:none;}
.rsidebar ul,.lsidebar ul{list-style-type:none;line-height:200%;font-size:11px;margin:0 auto;padding:0;}
.rsidebar ul li,.lsidebar ul li{list-style-type:none;margin:0 0 20px;padding:0;}
.rsidebar ul li ul,.lsidebar ul li ul{list-style-type:square;margin:0 auto;padding:0 3px;}
.rsidebar ul li ul li,.lsidebar ul li ul li{list-style-type:none;border:0;border-bottom:#dadada solid 1px;margin:0 auto;padding:0;}
.rsidebar ul li ul li ul.children li,.lsidebar ul li ul li ul.children li{list-style-type:none;border:0;margin:0 auto;padding:0;}
.rsidebar ul li ul li a,.lsidebar ul li ul li a{text-decoration:none;}

Code (markup):

Many thanks to anyone who can help.

 

Are you using the rich-text editor?
Try using the plain one and insert HTML in there.

 

Rich Text editor there cuts out those......go to Visual view and hit enter(where u need a break)...may work...

 

This will work, I use it, put it where you want break in the code view:

  <p align="left">&nbsp;</p>
  

Code (markup):

 

This sill gets stripped with mine when I go back to edit it.