I don't know if there's any correlation, or if it's just some bizarre coincidence, but... during the last few days, I've had to move threads and split posts into new threads. Shortly afterward, my users have encountered problems with modifying attachments, posting new messages, and editing existing posts. When I checked the UCP for issues, I found an error log full of crash reports involving the search index. This is the second time since last month my board's search index has crashed. Thankfully, the solution I was given in this thread worked again, but now I'm wondering... What types of events can effect the index? How often I should check the error log? Should I plan on rebuilding it whenever I move posts and threads around?