When you create a new web part page in SharePoint, its left navigation column becomes empty. Reason for this is that the left side navigation is defined in the Master Page using "PlaceHolderLeftNavBar" content place holder and templates for Web Part Pages shipped with SharePoint override this content place holder and delete its content, thus displaying empty left navigation.
The solution for this is to change the page so it will not override the menu place holder, but inherite it from the Master Page. The place holders we are interested in are:
"PlaceHolderLeftNavBar" and "PlaceHolderNavSpacer"
Just open Sharepoint Designer and:
1. Open the web part page you want to add the menu to
2. In Code view, look for the following lines and delete them:
<asp:Content ContentPlaceHolderId="PlaceHolderLeftNavBar" runat="server"></asp:Content>
and
<asp:Content ContentPlaceHolderId="PlaceHolderNavSpacer" runat="server"></asp:Content>
Save the file. You will get a warning saying you are about to customize the page. Just go ahead and open that web part again. It should have that good old left navigation.
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