problem with 003 rack

This just started today… Wavelab 8.0.3 on a Mac using digi 003 as audio output… the sound is horribly distorted… Built in output is fine, and the 003 works fine with Wavelab 7… , and protools and RX…
has this happened to anybody else?
thanks

all better now…
after reinstalling, trashing preferences, and swearing alot… I changed the core audio buffer size to 256, and presto… it works