There is nothing to share with G in those folders normally, no reason not to block them and no advantage to unblocking those folders. Those lines in your robots.txt are not very likely to be involved with AdSense display issues. In your GWT account you can ask it to test your robots.txt and you can see if something in there is preventing google from accessing URLs you want them to find. They may show hundreds of "Blocked" URLs, but the URLs are usually ones you don't want to share anyway.
Have you tried to see if AdSense has any known issues that might apply to your setup?
Msg#: 4613152 posted 2:52 am on Sep 28, 2013 (gmt 0)
I think, but can't confirm, that they might have blocked me after using a blended link unit scheme. However, I've been unable to get any response from Google to help with this. (Guess that's what they think of small fry publishers). I have no real fancy setup, just a simple blog. Do you suggest deleting the robots.txt file?
Msg#: 4613152 posted 4:09 am on Sep 28, 2013 (gmt 0)
Your robots.txt file is where you list the files and folders you do not want crawled, and also where you list the location for your sitemaps to tell robots the pages you do want them to crawl and index. It is your tool to tell robots what you want and don't want them to do on your site. Good robots will generally follow your rules, though they are known to forget them when they follow links. Bad robots ignore your rules and do as they please. It won't break your site if you don't have one, but there is little chance that robots.txt has much to do with getting you "blocked" (or unblocked). If you believe your site has been given a manual penalty, that information would be available to you in your Google Webmaster Tools account.