Andrus, I haven't noticed this issue in 3.0B1's modeler (and I've done several schema generations). Perhaps the issue got fixed or an OS X Java update (I'm on Leopard -- 10.5.8) solved it? I definitely noticed the issue a while back using the 3.0M6 modeler, as did others here.
mrg java -version java version "1.5.0_20" Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_20-b02-315) Java HotSpot(TM) Client VM (build 1.5.0_20-141, mixed mode, sharing)
