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I have no idea why, but recently, all new comments on my WordPress site have broken avatar image links. Here is a page that shows the issue: http://joshnh.com/2012/10/12/how-does-line-height-actually-work/#comments

Any idea why this is happening? I haven't installed any plugins recently, so why has it started playing up all of a sudden?

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Developer Tools show a "bad request" error, so switch to the twentyeleven theme to be sure it's not a theme issue. And disable the W3TC plugin and see if anything changes.

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Thanks for the suggestions. Unfortunately neither of them fixed the problem. – joshnh Oct 17 '12 at 1:23
up vote 0 down vote accepted

Okay, so it turned out that the default path for the fallback image wasn't being set. I have fixed that (in functions.php) and it is working correctly!

Thanks to @songdogtech for leading me down the right path.

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