Same for me, but 1.5.2 has the old launcher and i have problems since 0.9.5 launcher update, before that i could play in 1.6 snapshots.
You said that my issue (MC-19396) is like this one but it's not! I don't have a laptop, and my launcher is always stuck and sends error messages!
Same for me, but 1.5.2 has the old launcher and i have problems since 0.9.5 launcher update, before that i could play in 1.6 snapshots.