Thank you for your question.
The problem is related to whitespaces in the template name. The bug was introduced with Sitefinity 3.7 indeed, and it has been fixed for our next service pack (which will be released shortly after SP1 of the RadControls - we will provide this package as well).
The workaround for now is to rename the templates or use such with no whitespaces in the name.
We apologize for the inconvenience.
the Telerik team