In Splunk 6.1, do you have to specify an index in the search line to have results pulled back? Ex. When searching for syslogs stored on the indexer, typing in sourcetype="syslog" would not bring back the complete results. I found that specifying the index would bring back the results. Index=* Sourcetype="syslog" brought back all the syslogs. Typing in (sourcetype="syslog") by itself would not yield much.
It depends on in which indexes your data resides, and which indexes your user or role is set to search by default. The default setting is to just search the main index, so if you haven't changed that and have data in other indexes, that's why you won't find all data unless you specify that all indexes should be searched.
This can be easily configured in the Access controls section in the manager.