Is the website keeping track of my program and blocking it from repeated visits somehow?

If you can hit this site twice in a row with your browser, then chances are good that they're doing one of several things:

• The site might be issuing a cookie on your first request, recording your visit, then noticing that you're not supplying the cookie on a subsequent request. Is your script detecting any cookies?
• The site might be noticing that you request the first page, but not images (including ads). The site then "flunks" you on subsquent requests for the home page. Some sites have gotten aggressive about making sure that their ads are seen. Try having your script fetch (and quietly ignore) images, .js files, .css files, etc., so that your script behaves more like a browser. Alternatively, try setting your browser to not fetch images, and see if you notice different behavior through the browser.
• They might be throttling based on browser type. Is your script pretending to be a well-known browser, or are you letting LWP supply a default value?

Ah. You posted code. Good. Try adding   $ua->agent("Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)"); to pretend that your script is a real browser.

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