Hi,
servingtulsa:. One of these master pages has a logout button on it... and it works on several of its child pages. On one page, however, when the postback even fires, the button's click event is never kicked off. The __EVENTTARGET is correct, but it never kicks off the event.
Please check whether there is a form tag in the conent page, because the Master pages has defined the <html>, <head>, <body >, and <form>, tags, it is needn't for the content page.
Because the content page will replace the content of the conetentplaceholder of the master page at runtime, so this will cause the form tags nested, which is not allowed.
In the aspx page, if you use more than one pages, there is only one form tag runat is server, and these form tags cannot be nested.
Hope it helps.