ampfixer
I'm using assistant and when I check for an update from within Melodyne, it indicates that .001 is the latest version. I think I'll stay put until I get more info on the .004 update.

Same here!

I wonder if the update is for Mac, and so Melodyne is seeing our Windows version is up to date?
Just an idea.

Sonar (all versions up to and including Platinum) has been one of the most stable pieces of software I have ever used.
Sonar Platinum is still very stable unless I use Melodyne (essential version). With Melodyne v 4 I have had numerous crashes and lost work :( 
 
I had Melodyne 4.04.001 installed and it didn't detect any updates automatically. So I went to the Celemony website and boy do they make it hard to find what the latest sub-version of Melodyne is. In the end I had to download it to find that it was version 4.04.004. I still get major crashes with this version especially when I am using Antares Harmony Evo in the same project. N.B. I can use Harmony Evo all day long in Sonar without any issues. I have taken to working in Melodyne outside of Sonar and then importing the wav files produced into my Sonar project. EDIT: Scrap that I have just had Melodyne crash running standalone as well :(