Thank you so much for your feedback. We will be rolling out a new version with a fix for this issue today. Please let us know if the problem persists.
In the theme name we have inserted the website template's name, not a master page's name. This was due to the fact that you might want to have a theme with the same name in 2 or more website templates but Sitefinity will not let you register 2 themes with the same name. The same is true for the master pages and page templates. We have taken your feedback into consideration and will be making a change in the next regular release (the hotfix today will be just for the master page registration).
After the hotfix, you can go to the page templates and rename them. When you update an existing website template, a new page template will not be created if there is an existing one that is using the master page. The same will be true for the themes after the regular release.
If you put songs like that in your videos, I might have to ask you for videos more often ;)
All the best,
the Telerik team
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