My logfiles are processed and results appear ok up till 21:00hrs. Then no analysis appears to bew done until the next day from 00:00hrs?

20 197 983 2.85 MB
21 0 0 0
22 0 0 0
23 0 0 0

I know there are entries in the log all the way from 00:00:44 - 23:58:33 in yesterdays log and all the others too.

Any one got a clue what's going wrong?