Render Problems with a Masking in Vegas after Using Mocha

Hello,
I have a problem with Mocha Pro.

I have masked an object with Mocha and now I want to render the clip. In the preview everything is ok as soon as it renders the mask does not adjust anymore.

in preview:

in rendering:
image

I don’t know what to do anymore. The only plugins I still use are Saphire and Mocha.