Slimstat email report plug in V3.3

Hi, my Slimstat Email Report plug in was recently upgraded to V3.3 and we are now getting no data in my daily report. Prior to the upgrade, I was receiving data in this report. My reviews of various live Slimstat reports shows that site traffic is continuing.

A check of Settings-> Maintenance comes up with the following message:

Tracker Status 210 Notice: Prefetch requests are ignored

Any suggestions??

Thanks

https://wordpress.org/plugins/wp-slimstat/