Woke up this morning and DNN not working. 

Steps I've taken:

Replace dotnetnuke folder with a previous version a few days old.
Restored database to previous backup from 2 days ago.

Rebooted. Same thing.

I could really use an assist on this one.

Thanks!
Chris

Here's the basic error:

DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at DotNetNuke.UI.Skins.Skin.GetSkin(PageBase page)
   at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e) in c:\inetpub\wwwroot\dotnetnuke\Default.aspx.cs:line 650
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   --- End of inner exception stack trace ---

Here's the XML:

<LogProperties>
        <LogProperty>
            <PropertyName>AssemblyVersion</PropertyName>
            <PropertyValue>7.3.2</PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>PortalID</PropertyName>
            <PropertyValue>9</PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>PortalName</PropertyName>
            <PropertyValue>Store - Jamie Kent</PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>UserID</PropertyName>
            <PropertyValue>-1</PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>UserName</PropertyName>
            <PropertyValue />
        </LogProperty>
        <LogProperty>
            <PropertyName>ActiveTabID</PropertyName>
            <PropertyValue>465</PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>ActiveTabName</PropertyName>
            <PropertyValue>Store</PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>RawURL</PropertyName>
            <PropertyValue>/Default.aspx?tabid=465&amp;error=An%20unexpected%20error%20has%20occurred&amp;content=0</PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>AbsoluteURL</PropertyName>
            <PropertyValue>/Default.aspx</PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>AbsoluteURLReferrer</PropertyName>
            <PropertyValue />
        </LogProperty>
        <LogProperty>
            <PropertyName>UserAgent</PropertyName>
            <PropertyValue>Mozilla/5.0 (Windows NT 6.1; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0</PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>DefaultDataProvider</PropertyName>
            <PropertyValue>DotNetNuke.Data.SqlDataProvider, DotNetNuke</PropertyValue>
            </LogProperty>
        <LogProperty>
            <PropertyName>ExceptionGUID</PropertyName>
            <PropertyValue>b1eba570-b958-42ee-9952-2484762595e3</PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>InnerException</PropertyName>
            <PropertyValue>Object reference not set to an instance of an object.</PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>FileName</PropertyName>
            <PropertyValue />
        </LogProperty>
        <LogProperty>
            <PropertyName>FileLineNumber</PropertyName>
            <PropertyValue>0</PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>FileColumnNumber</PropertyName>
            <PropertyValue>0</PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>Method</PropertyName>
            <PropertyValue>DotNetNuke.UI.Skins.Skin.GetSkin</PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>StackTrace</PropertyName>
            <PropertyValue />
        </LogProperty>
        <LogProperty>
            <PropertyName>Message</PropertyName>
            <PropertyValue>DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---&gt; System.NullReferenceException: Object reference not set to an instance of an object.
   at DotNetNuke.UI.Skins.Skin.GetSkin(PageBase page)
   at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e) in c:\inetpub\wwwroot\dotnetnuke\Default.aspx.cs:line 650
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   --- End of inner exception stack trace ---
            </PropertyValue>
        </LogProperty>
        <LogProperty>
            <PropertyName>Source</PropertyName>
            <PropertyValue />
        </LogProperty>
    </LogProperties>