Hello,
I am having a similar issue.
When viewing the report Visitors -> Daily Visit Length, it can be noticed that the visit length changes from an average of about 100 seconds to an average of 10 or less after April 29. Also on this page it shows the # of visitors averaging around 1,500 a day down from about 35,000 a day.
However, when looking at the Monthly Visitor view, it shows the number of visits for May up to 1.4M, whereas in April it says 1.0M
Can someone make sense of this please? We have re-processed and re-imported a number of times. When importing the same log files into Urchin, the stats are fine. What puzzles me is it was going fine forever until now.
This originally occured in v3, we installed v4 and the same thing happened. The strangest part is it was working fine for a month or so in v4 until suddenly it happened again.
Any insight is appreciated.
Thank you,
-Brock