If you are updating to eventON 2.6.7 using manual method by deleting old eventON. Before you do this, be sure to set “Do not delete eventon settings & data when EventON is uninstalled” to NO — to avoid potential losing event data during eventON plugin deletion process.
This issue will be fixed in EventON 2.6.8, however when updating from 2.6.7 to 2.6.8 the EventON Settings value for “Do not delete eventon settings & data when EventON is uninstalled” still must be set to NO. From 2.6.8 onward only, this value should be set to YES before deleting old eventON.