When I go on singleplayer, the world list is flickering / the world's names are moving. Doing it with the server list also (multiplayer). It seems to do it when there is no scrollbar in the list (small number of world/server).
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I wasn't doing it for me. But when you have a lot of map/server in the list, the scrollbar appear, and in this case, there is no bug. The bug appear only when there is a small number of map/server in the list (no scrollbar).
Duplicate of MC-50965 – If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
Same happens for me, mavericks with JDK7 installed. Also happens in multiplayer screen.