Valid for Sitecore
6.x
[FIXED] Page Editor conflict with master pages
Note: This known issue was fixed in Sitecore CMS 6.5.0 rev.11123 (Update-2).
Reference Numbers: 309095, 326583, 315418.
Page Editor conflicts with master pages.
Workaround.
Include the placeholder with key=”webedit” to host the Page Editor buttons. This placeholder can be inserted either on the master page or inside of <asp:content /> on the content pages (layouts).
<sc:placeholder key="webedit" runat="server" />