Last week I got some trouble with this site. I can’t do anything. The message just keep appeared when it tried to do something.

Fatal error: Out of memory (allocated 90439680) (tried to allocate … bla bla bla..

So what I do to fix it is, deactivate all plugins, re-install automatically WordPress core (upgrade tools), and it works again as usual. But some plugins still not active, still looking around, in case one of the plugins have bugs.

Update [1]: If you using gears (extension that allows to navigate on compatible websites offline and synchronize when going back online) don’t forget to re-enable after WordPress re-install.