(I actually found a fix that works quite well last night, I meant to post a "Removing foot from mouth" post but forgot)

Basically, I had gotten in the habit of using the following in my CSS:

body {
    background-color: #ccc;
}

Since whenever I used a wrapping DIV to define the bg, it never filled the whole browser. However while talking with my SysAdmin while he was upgrading one of my sites, we realized that the default DNN containers didn't exhibit this behavior and that the problem might have been resolved.

So I sat down and looked over the default skin's code and copied some basic elements with the following:

HTML:
<TABLE class="skinmaster" width="770" border="0" align="center" cellspacing="0" cellpadding="0">
    <TR>
        <TD id="ControlPanel" runat="server" class="contentpane" valign="top" align="center"></TD>
    </TR>
    <TR>
        <TD valign="top">
<TABLE class="skinheader" cellSpacing="0" cellPadding="3" width="100%" border="0">
    <TR>
        <TD valign="top">
<!--Contents here-->
        </TD>
    </TR>
</TABLE>

CSS:
.pagemaster {
    width: 100%;
    height: 100%; 
    background-color: #598427;
}

With that, everything is working just peachy. I had a feeling it was something basic I was looking over.

Thanks!

SB