After only being able to install the full versions of Wavelab 10 due to receiving CD/DVD failure errors (previosly posted) and not being resolved with suggested fixes, I updated to v11. and did not get any CD/DVD errors breaking the external device. I also updated to v11.0.10 full successfully after recieing the CD/DVD error on installing the v11.0.10 update. Now v11.0.20 has arrived and guess what it has broken my CD/DVD player so have uninstalled and re-installed to v11.0.10 Full to fix it. Obviously there is something in the developers code for the updates that is not present in the full versions so should be investigated so we can safely update rather than having to wait for the next full iteration.