getting empty result but numFound > 0

[Rafael Pappert]

Hello List,

i'm evaluate solr 4 / solrCloud and got the following problem.
I've indexed ~1.5M Documents but the "docs" section in the response is always
empty. The response for the *:* query looks like this:

{
  "responseHeader":{
    "status":500,
    "QTime":12,
    "params":{
      "fl":"title,img",
      "indent":"true",
      "start":"0",
      "q":"*:*",
      "wt":"json",
      "rows":"10"}},
  "response":{"numFound":1441958,"start":0,"maxScore":1.0,"docs":[]
  }

The schema.xml has a lot of stored/indexed fields. Any hints whats wrong?

Thanks in Advance,
Rafael.