versionoperations.jsp uses version name when constructing id for the link, e.g.

<a id="archive_<webwork:property value="name" />" ...

The problem is that version name can contain characters that are not valid in HTML.

ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").