6.3.3 was released today as a further stabilization of 6.3. This version is released only a few days after 6.3.2 and it solves the following issue:
VWG-4128 - Showing of dialog form or messagebox from with in a dialog form should not hang browser the second time.
All 6.3.3 downloads can be found here.
Professional Studio can be downloaded directly from here.