Issue: some version between WP 4.1 and WP 4.5.2 changed the way the link HTML was being produced for tag clouds. This change caused the CSS in 'widgets_tagcloud.css' to be ignored. The following fix will correct this issue.
edit function.php and change line 242 from
HTML Code:
$tags = preg_replace_callback("|(class='tag-link-[0-9]+)('.*?)(style='font-size: )(.*?)(pt;')|",
to
HTML Code:
$tags = preg_replace_callback("|(class='tag-link-[0-9]+)( t.*?)(style='font-size: )(.*?)(pt;')|",
or you can replace the existing 'montezuma/
functions.php' with the attached file (after unzipping it).