I cannot really talk about any issues with Leopard because, as you know, Leopard is under NDA, which, like me, you must have signed to be using it. All I can say is that the next beta, 1.02, is fully Leopard-compatible, whereas there are a couple of minor issues between 1.01 and the the latest Leopard seed.
P.S. Moving this to technical support, where it belongs.
I have one.
Since I upgraded to Leopard it's impossible to see highlit objects in Outliner. Whenever I highlight something, the text turns white. I haven't figured out a way to make it turn back to black.