My application also recently stopped receiving results. We've been using the following query for a while (replacing the url parameter).
CODEBOX
http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20rss%20where%20url=%22http://api.5min.com/category/37/videos.xml?num_of_videos=5%22
From my dev host I receive results, the query above returns:
CODEBOX
<?xml version="1.0" encoding="UTF-8"?>
<query xmlns:yahoo="http://www.yahooapis.com/v1/base.rng" [^] yahoo:count="5" yahoo:created="2011-01-27T15:58:16Z" yahoo:lang="en-US"><results><item>
<id>516934102</id>
<title>An Interview with Sebastian Toutant</title>
<description><a href="http://www.5min.com/Video/An-Interview-with-Sebastian-Toutant-516934102"><img [^] height='100px' width = '150px' alt='' src="http://pThumbnai [^]
ls.5min.com/10338683/516934102_14.jpg"></a>
In this video, WatchMojo speaks to pro snowboarder, Sebastien Toutant, about his snowboarding goals and what it's
like to return to RIDE Shakedown.
</description>
<link>http://www.5min.com/Video/An-Interview-with-Sebastian-Toutant-516934102</link> [^]
<enclosure duration="172" type="application/x-shockwave-flash" url="http://embed.5min.com/516934102/"/> [^]
<geoRestriction>ALL</geoRestriction>
<media:content xmlns:media="http://search.yahoo.com/mrss/" [^] bitrate="600" duration="172" expression="sample" fileSize="0" lang="eng" type="video/x-flv" url="http://lvide [^]
os.5min.com/5169342/516934102.flv"/>
...
When the same is run from my production host (this is located at a different datacenter w/ a different IP) I get the following:
CODEBOX
<?xml version="1.0" encoding="UTF-8"?>
<query xmlns:yahoo="http://www.yahooapis.com/v1/base.rng" [^] yahoo:count="0" yahoo:created="2011-01-27T15:56:53Z" yahoo:lang="en-US"><results/></query><!-- total: 55 -->
<!-- engine1.yql.mud.yahoo.com -->
I've been able to reproduce this all day yesterday and this morning. I checked the rate limiting and if I were exceeding limits the documentation indicates that I should receive an error indicating that. I assume since others are having similar issues that something else must be occurring.