"More world options" freezes only in snapshots.

I open my launcher on a windows 7 laptop, no problem, i can create new worlds in 1.7.9 and for exaple ad a seed and change type of world without a problem, And i can create a new world in snapshots as long i don't press the "more world options..." button.

From the moment i click that button it goe's to the right "page/screen" but when i hover over a button it doesn't turn blue, when i click it it turns blue after half a second but there's no clicking noise or a change. there's no cursor to type a seed if i click on it everything just sort of freezes. i can't press done, somethimes when i press cancel it does cancel afther a while.

This only happens when i use any snapshot i've testet so far (the last 3 snapshots)

i noticed this when 14w10c came out but i tought you would patch it in the next one. when i wanted to test the costumiseble world i saw it wasn't fixed.