I have been here off and on for years trying to sort out this blasted "out of memory" error. I get this error when trying to upload a picture with one dimension larger than 400px to a post, when automatically installing most plugins, and when attempting an automatic upgrade.
BUT I am also getting these errors 100% of the time in my dashboard. And, from time to time, I am getting one at the top of a page in my admin panel, that prevents me completely from doing what I need to do.
The problem does not seem to be tied to a particular plugin, etc.
I have already tried increasing my memory to 128 by all of the methods suggested on this forum. I have talked to my host, and he agrees that there is no way a WP installation should truly be using more memory than that, so we think the problem is something else.
I have this issue on multiple WP installations, but not on ALL of them. I have tried finding a new host, and moving one of my blogs over there, and have the same issue, so I don't think it's the host.
I have noticed that if I do a clean install, it's fine, but as soon as I move my database in, I get the errors, so I'm wondering if it's a database error of some kind.
This thread seems most closely to follow my issue, and "Nigel" seems to have encountered the same thing I did. But I don't have a database backup I can install from a time before the errors. (That is, the errors started soooo long ago that I can't go back that far without losing hundreds of posts.) Is there some way to diagnose and fix this type of error, without just wiping out the database and starting over?