Problem with V-Vocal

I am having a peculiar problem with v-Vocal clips that I have not had so far. When i try to convert some of my vocals tracks to a v-vocal clip, it processes it but does not display a wave form. I went through all sorts of settings and could not find any reason for this. My previous projects where v-vocals have worked successfully would still create v-vocal clips properly. in addition, i can convert some of the other clips in my recording into v-vocals. i am finding that anything new i am recording does not display the waveforem in the editor. i am wondering if i have mistakenly activated some setting that is interfering with v-vocal?

I have had this happen a couple times too. After creating the V-Vocal clip, the V-Vocal display showed a straight horizontal line where the wave form should be. And when I closed V-Vocal's display, Sonar's track view then showed a flat line too - no wave form - it was as if V-Vocal erased the wave. If I recall correctly, the clip was actually silent when I tried to play it. Doing an Undo "Create V-Vocal clip" restored the wave display in Sonar, as well as an audible clip - that is, back to where it started before trying to create a V-Vocal clip.

I don't remember for sure how I got around this. I think I may have saved the project, closed Sonar and restarted. Then the create V-Vocal clip worked.

I think it this a problem with V-Vocal, which is a great tool, but with a few bugs still in it.