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Blank page after posting comments in WordPress 2.6 – Im creating this post because I had this issue and spent a few hours filter through the many post on this topic but none of the resolutions either worked or were exactly like mine to begin with. So experience is as follows:

Issue:

• At some point after upgrading to 2.6 I noticed that users that submitted comments were getting a blank page ending with normalstuff/wp-comments-post.php.
• However, I could comment on the same post without any issue while logged in as an admin.
• The problem only happened on older post, post created a couple of versions prior the 2.6 upgrade. Post created following the 2.6 upgrade worked both as the admin and the user.

Resolution:

• The wp-comments-post.php document contained a blank line after the closing php tags “?>” (around line #85). This causes issues in PHP at times. I removed the blank space, tested posting comments to at least 3 post that had failed prior and the issue appears to be resolved.