Doug: you're having the same problem i have. The only difference is that i use MS SQL Server 2000 and a BIT datatype to represent a boolean type.
Please read the post by brecicure (me). I think this problem is a bug, but none of the jboss developers has replied yet, and i'm not sure whether a bug should be submitted...
Upgrade to 3.0.2 (or 3.0.1).