Why doesn't my page know it's a page (won't return true for is_page())?

Question

I have a page with the slug blog. Mysite.com/blog correctly renders from the template file page-blog.php. However, it does not execute footer code from my theme that's conditioned on is_page('blog'), nor does it have an "Edit Page" link in the Admin bar.

I also have a custom post type called blog, but this page doesn't execute code for is_post_type_archive('blog') either. In the admin bar, there is no "Edit Category" link or "Edit [Anything else]".

This is the info the WP Debug plugin gives me when I load the page:

Request:
blog

Query String:
pagename=blog

Matched Rewrite Rule:
(blog)(/[0-9]+)?/?$

Matched Rewrite Query:
pagename=blog&page=

What could be the problem?

Answer 1

The problem was due to a secondary loop in the page—before this loop, the page knows it's a page; but after the loop (and in the footer, where the Admin Bar and my code would be rendered), the page thought it was the last post of the secondary loop.

Neither wp_reset_query() nor wp_reset_postdata() worked; I am guessing this has to do with the fact that I use $wp_query as the name of the secondary loop (so that I could use the loop.php template file to display the posts). Here's the code that worked:

$temp_query = clone $wp_query; 

$wp_query = new WP_Query( 'post_type=publication&posts_per_page=5' );

get_template_part( 'loop' );
/* get_template_part( 'loop' ) only seems to work if the query is in $wp_query */

$wp_query = clone $temp_query; ?>

Here's the link in the codex that the clone $wp_query technique comes from: http://codex.wordpress.org/The_Loop#Multiple_Loops_Example_2