Normally when you create a keyword in Google AdWords and that keyword requires a higher bid amount to show up in the Google AdWords section of the search results, Google will tell you exactly how much you need to bid to show up.
The picture to the right, shows an example of a Google AdWords warning where a specific keyword is not showing because it is "Below first page bid." And as you can see under the warning, Google is telling me I need to bid at least $0.30 to show up on the first page.
But yesterday, and I confirmed this, many of these warnings were showing up without showing the minimum required bid to show up. So Google was telling you that you were not bidding enough but not specifying how much you need to bid to show up.
I believe the bug is now resolved, if not, you can complain with the other advertisers at WebmasterWorld.
Forum discussion at WebmasterWorld.