Wanted to chime in on this item as it still can occur in the latest 3.5 version.
I noticed that if I am creating a new master.template and even simply drag and drop a new Content placeholder control on the page I can end up with the greyed out zones in overlay mode.
simple drag and drop result:
|1||<div id="menu"> |
|3||<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server"> |
what i now do to avoid this issue is simply use short notation to close the tag and drop off the separate placeholder closing tag /> this seems to work flawlessly.
|<div id="menu"> |
|<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server" /> |