If you open up the creative menu and search for an item (in my case, stone brick) but are given an effect by a player, beacon, etc, the text is pushed under the "Search Items".
Environment
Windows 8.1
4gb RAM
Intel Core i5-3230M - 2.6GHz
Intel Graphics 4000 - 1760mb
Java version: 1.8.0_11
Confirmed for 1.8-pre1, also happens when a potion effect runs out while you're in the inventory.
edit: This duplicates MC-64598.