The number comes up on launch and then, partly, in the About box, so yes, it is the correct serial number.
While using the software I got a message saying an upgrade was available, but, of course, upgrade can't install without quitting VW, and couldn't quit VW without losing my work. Finally had to quit, lose work, install SP2 and now VW saves ok. Must say I'm very frustrated by this little episode. Mature software such as this shouldn't have these serious quality issues.