I found a bug with the search function. If you search for something on one event sheet, then go to another event sheet and clear the search, you'll only be able to see the results of the search when you go back to that original event sheet. Since you already cleared the search, there's nothing you can do to get it back except close and reopen the entire project(reopening the event sheet itself doesn't work).
This is extremely easy to replicate, but here's a cap anyway with two sheets with one nonsense event each:
Hopefully it's not just my computer. <img src="smileys/smiley5.gif" border="0" align="middle" />