I have similar problems with recordnow 4.50 (btw, where can I find an upgrade 4.5-->4.6?) and PxEngine 5.07 (I got this stuff from Herrie site) and Haerrie beta9.
THANKS AGAIN HARRIE 4 your work!
Moreover, regradless my choice, with several +RW dvd record Recordnow claims 1x and after 1 minute moves silently to 2.4x (the remaining time becames less than half).
I experimented that with different firmware and in all cases NERO gave me the right choices (the one coming from DVD Identifier).
So if anyone has some ideas....