The issue with the property name and value being made visible by Add Properties was logged internally by Mentor staff, unfortunately since it was logged we've been unable to reproduce it for engineering to analyze. You could say this is good news as it appears to have been resolved indirectly, certainly working with our latest version of software it appears this way. If you have a consistent way of reproducing the effect with a specific version of the software then open an SR with Customer Support and we can analyze it further.
We're also looking at the issue you ran into when trying to correct the initial problem, but so far without success. Again, if you can consistently reproduce this log it with Customer Support.
We've retested this with the forthcoming VX.1/PADS 9.6 release software and cannot reproduce it based on several different scenarios and steps. It looks like this has been fixed indirectly as we suspected.
I've already raised an SR for the bug which causes the property name to be visible when adding RefDes, with the scenario which always seems to cause the effect. Hopefully they can test that in the new release too.
I'd ask if there is an ETA for the new version, but in all probability I won't see it for a while after it's been released . Is there a pre-release list of expected fixes/changes publicly available anywhere?
(Update: Engineering have tested that and it is also fixed in VX.1 - now I can feel even more depressed about any delay between the release and being able to use the new version)