The worlds and servers in the 'Select World' and the 'Play Multiplier' screens flash rapidly between their proper slot in the list and the slot below. Happens with default resource pack and (as far as I can tell) any number of items in the list.
Environment
Windows 7
Java Version 7 Update 45
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.