The new launcher works great. there is just one thing that happens quite randomly. sometimes when the launcher starts or during playing. the grass and workbench icons turn into default "java program" icons.
It's not that big of an issue! but it's a bit annoying that when i'm running a server I can't distinguish the game from the server :/
On which Minecraft version does it happen? If 1.5.x, then dupe of MCL-105.