Kibana does not show data

Hi All,
My system is on Kubuntu with elastisearch 1.7.2 plus Kibana 4.1.2
After indexing thousands of indices I have created, in Kibana, the pattern mapping correctly as the "applogs" shows,
But discover tab doesn't show any data.
I have tried procedure more than once without success
What can II still do ?

note: it's not a matters of time filter

Thanks in advance

do you have any advices ?

Do any fields populate in Settings after you set up the pattern? Could you include a screenshot of the index setup in the Settings page?