After doing some investigation, I've discovered that the de-install of BandLab corrupted a number of my vst plugins on the new Sonar, especially the DX plug ins. All of which, worked perfectly before the de-install.
For example, TTS-1 synth is broken. It's in the scan directory. It's listed in the registry as being there and nowhere else. There is a GroovePlayer plugin found in the plugin manager in Cakewalk, which is in the same path as TTS-1. When opening the plugin manage, it find GroovePlayer but not TTS-1. It also warns both are unavailable when opening a project that uses TTS-1. I haven't knowingly used GroovePlayer in any project.
If anyone has any helpful insights to solve this, it would be greatly appreciated. Thanks.