I was considering coming here earlier to post about how useful Mix Recall is, since I'm usually quite negative about the new Sonar features that appeared in the last year. Unfortunately I'm instead coming here to complain because Mix Recall lost some of my settings. It seemed to switch between them properly to begin with, then I did a Export so I could compare 2 mixes more quickly. After that, it has 'restored' my mix to a state where several plugins (specifically, Voxengo Voxformer and NI Solid Dynamics) have lost their settings, settings that took me ages to dial in. I don't know for sure whether the problem is with Sonar or with the plugins, but the plugs have never given me trouble before.
So, thanks but no thanks. Now I spend my afternoon trying to get back to where I was before.