WP 3.6 – Affects my button shortcode & lightbox

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Version of WordPress: 3.6
Theme: Energy
Recently Installed Plugins: None
Customized something recently: No
Direct Link to Page with Issue: https://membervalue.calicomarketing.com/define/

Details about testing cause
1) Button on client’s server worked fine (no errors) until they updated to WordPress 3.6.
2) To test the cause of the issue I opened the test server. At the time I had not yet updated any plugins or WordPress version for 2 months.
– 1st, I updated the plugins. Button worked fine.
– 2nd, I updated to WordPress 3.6. Button stopped working.

I concluded it was likely the WordPress 3.6 update. I was wondering if anyone had a fix for this issue.

Thank you.
Where does the button shortcode originate? Is it a plugin?

The button shortcode came with the template.

It works with PrettyPhoto.

Shortcode.php

function energy_buttons( $atts, $content = null ) {
    extract(shortcode_atts(array(
        'link'      => '#',
        'size'    	=> 'medium',
		'target'    => '_self',
		'lightbox'  => false,
		'color'     => 'white',
		'icon'		=> '',
		'style'		=> ''
    ), $atts));

    if($lightbox == true) {
    	$return = "prettyPhoto ";
    }
    else{
    	$return = " ";
    }
    if($icon == '') {
    	$return2 = "";
    }
    else{
    	$return2 = "<i class='icon-".$icon."'></i>";
    }

	$out = "<a href=\"" .$link. "\" target=\"" .$target. "\" class=\"".$return."button ".$color." ".$size." ".$style."\" rel=\"slides[buttonlightbox]\">". $return2 . "". do_shortcode($content). "</a>";
    return $out;
}

Do you have the same problem using twentytwelve or twentythirteen theme?

Solved for my issue:

My issued was WordPress 3.6 didn’t like the shortcode’s tag lightbox=”false” or lightbox=”true”. Once I removed it, the button worked again without errors.

Not Working Button:
[button link="https://www.google.com" size="medium" target="_blank" color="green" lightbox="false"]You Button Text[/button]

Working Button:
[button link="https://www.google.com" size="medium" target="_blank" color="green"]You Button Text[/button]