Check whether pending log file (Administrator > Setup > Log Sources > Jobs)
Check Web Reporter services. If they are still running, restart both of them.
You may copy the files to a different location. Then you may write log files to database by using a new log source.
Hi Zoltan -
These are the access log files that your MWG sent to Web Reporter. When they are in the processing directory, they wait their turn to get parsed by WR and the inserted into the Database.
Deleting these files would not give WR the chance to parse/insert and therefore cause you to not see data in your reports for the timeframe encompassed in your logs.
Move these files to a different partition to reclaim storage; don't delete unless you don't care about the data.
Thanks for your answare!