Hey Paolone, I have had similar problems running it in VirtualBox and I seem to have narrowed it down the sound. VirtualBox version is 4.3.18 r96516 under MAC OS X Yosemite. The particular problem I am having is with ICH AC97. Icaros detects it but when I play a test sound, it shortly plays and then freezes the AHI window. The other sound devices from VirtualBox are not detected by ICAROS. The Virtual HDD is 5GB and 1GB Ram.
I'll provide more details when I get a chance to play with it more.