A sneaky intruder got into my blog three days ago. S/He turned off two of my posts, making them "private" instead of "public". When I tried to edit these two posts, the network simply took forever to display the contents. However, when I clicked on other parts of WordPress, there was no such problem.
What could be the cause of this problem? And what loophole is there to enable that intruder to get into my blog and even lock up those two posts from further editing?