I've been using Viveza since it came out. I have the latest version, and use it with the latest version of Photoshop CS6 on files I send to PS from LR4.3, also the latest version (on a Windows 7 64-bit machine).
Just recently I noticed that after some global adjustments in Viveza, when I add one or more control points and operate them locally, when I want to make more global adjustments and click somewhere in the image, the control panel remains on the "Selective" setting. The only way I can return to Global is to add another control point without adjusting its sliders and then deleting it. This is a new problem. I will probably try uninstalling Viveza and reinstalling it tomorrow, but I wonder if anybody else has run into this issue.