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"Parse error: syntax error, unexpected T_CLASS..." Help!

Make sure your host is running PHP 5. Add this line to wp-config.php to check:

var_dump(PHP_VERSION);

Why are the images displayed two times?

Probably because you used the template tag and forgot to uncheck the content, excerpt or feed checkboxes from the Settings page.

Why aren't my images aligning properly?

This is due to your theme's CSS. Check if you have something like this in style.css:

img.alignleft {float:left; margin: 0 1em .5em 0}
img.alignright {float:right; margin: 0 0 .5em 1em}
img.aligncenter {display:block; margin: 0 auto .5em auto}

What if I don't want to use the widget?

You can add <?php cfi_loop($query) ?> directly to your theme files. $query is an optional parameter, which acts as a query string.

How can I delete a custom field image from a post?

Just clear the URL field and save the post.