This question may be related to a resolved thread.
I have the exact same issue with a site that has multiple member groups and runs MSM with 14 sites. This definitely is an issue with the number of groups/sites and is a real problem. This error now shows up even if not making any change to the member group by just hitting the “update” button. After this error takes place all of the member groups loose their channel assignments and the entire DB has to be restored.
We’ve approached engine hosting about the array size solution mentioned in #9 of the related post [above], however, our original assumption, that there isn’t an array size configuration in Apache was affirmed and this solution was not realistic.
We run dozens of websites, most on MSM and have never run into this.
This site is fully updated to the latest 2.4 with the latest MSM etc…
Please help.