The IQueryExpression will give random results if the indexing is ongoing. Have you checked if the indexing had finished and if the lucene index was fully built?

I think its finished, it seems so in admin mode. It succeeds in seconds. Where can i see if the index is fully built? The files on disk looks correct. I can search for all the content but it doesnt sort on published/changed date.

Typically the indexing job is the first part of the process, the second is when Lucene is analyzing and organizing the index. This may take a while. And if you run the indexing job to often, ideally you only run it once, the index will never be completely structured by lucene.

Okay, I see. Thanks for great info. If I delete the index files on disk, will it be better organaized if I then run the indexing job once after that? Guess I've run the job too many times :)