2
No XOOPS specific advise but:
http://www.experts-exchange.com/Web/Web_Languages/PHP/Q_21066345.htmlPossible solutions by setting the momory limit higher. Of course its preferable to find the cause but i have no idea there.
Did you try a restart of your web services? (apache or whatever)
Seems other users have this error to in regards to places where a lot of users are handled (several thousands) so it could be a similar issue.
Try to google xoops.org for this error message:
Search string:
"Fatal error: Allowed memory size of 8388608 bytes exhausted" /kernel/object.php site:www.xoops.org
Sorry, this signature is experiencing technical difficulties. We will return you to the sheduled signature as soon as possible ...