First of all, I am enjoying this program v0.98 immensely.
This may have been reported already, but here goes anyway...
after copying a portion of a sound file and pasting into a new project,
saving and closing the new project causes program to crash, finder asks for
restart to stabilize system.
if audacity is opened without restart, just about any action in the program
will cause a freeze forcing hard-restart.
hope this helps, keep up the great work.