This plugin displays your geo tagged Twitter tweets on Google maps and also shows your Twitter, Twitpic, Twitgoo, and yfrog photos.
The info windows are inheriting CSS styles from the page. Please override the offending styles by using the custom css option on the plugin settings page.
The tweets are updated hourly by a WordPress cron
The twitter image hosters often use proxies to store the photos and sometimes the proxy url has become stale leading to a missing image.
If you are using this plugin on a website that uses an SSL certificate, your url will start with "https://", then yes.