Hey there! I just saw your message because I was doing an upgrade to Mavericks with DP 8.07 and ran into a snag...
Guess what? VE Pro 5 version 5.3.13333 does not work and creates a very annoying error message that requires a force quit. Yuck.
Mas,0 error reported by Mas Audio Unit Support
Failure: Base::New 160 -50 [-50]
As it turns out, we need to downgrade to the previous version of VE Pro 5, which is 5.3.13240
Available here:
http://www.vsl.co.at/en/68/428/2022/1709.htm Current version of Kontakt runs fine, no problems with Omnisphere and MachFive (these are the only virtual instruments I use).
I've found Mavericks to be a smidge faster for most processes, with this VE Pro problem being the only issue thus far.
Hope this helps!