JPA hangs Grails, Part 2

As I wrote before, using Java JPA in my Grails application, the Grails application (0.6) hanged. After not much help from the mailing list, I updated to Grails RC1.0 without success. Adding the newest Hibernate JARs and Annotations JARs to the grails/lib directory solved my issue though. Grails no happily uses my JPA/Dao backend. Puh.