Hi Richard
We tried to reproduce this problem by installing the 1.6.1.0 version, followed by the 2.0.5.1 version of Essential Suite on a fresh machine in our QA Lab. As demonstrated
in this screenshot, running the Assembly Manager from the 2.0.5.1 version picked both the versions and updated the Public Assemblies folder and the GAC with the proper dlls.
I discussed this with the person in charge of our installs and one thing he wanted to know was if the versions were installed under different user names (with different permissions?)
Regards
Arun