We've had this pop up a few times in the past two months. I had our PHP memory limit set to 160MB; I got the error message saying the "Allowed memory size of xxxxxxxxxx bytes exhausted (tried to allocate xx bytes)". I bumped the memory limit to 200MB and the error went away. Tonight, one of our moderators tot the message, and I bumped memory up to 256MB. We are running the most recent Enhanced Search add-on for XF 1.2.3, indexing 9.3 million messages / 327,626 discussions / 36,296 members, and have an add-on that lets us index personal conversations as well. I don't know if the Enhanced Search is the cause of it, but using search certainly seems to trigger it. Is this memory usage going to keep growing quickly like this, or is there something else I should look at? I really do not want to press PHP higher on the memory limit if I don't have to.