I’ve come up with a workaround for this problem, at least until the plugin is updated. On line 135 of /wp-content/plugins/multiple-content-blocks/multiple_content.php I’ve added:
$content = str_replace("\r","<br/>",$content);
It’s a little funky, because it sometimes adds an extra line break where it doesn’t need to, but switching between WYSIWYG and HTML views seems to fix this.
Hope it helps.
