Hi Marco,
Pd's ALSA support isn't working in the current release. I'm trying to fix that right now as it happens... as soon as I get it happening I'l put a test release out.
I don't know which previous versions worked under ALSA either... I've only now got ALSA running stably on my machine.
At any rate, when Pd is compiled with ALSA support, you still have to specify "-alsa" on the command line to select it.
cheers Miller