BookmarkWidget to be leaked?

Has anyone seen this error message?

warning: The class widgets.Bookmark.Bookmark has been used in a call to net.registerClassAlias() in _BookmarkWidget_FlexInit. This will cause widgets.Bookmark:BookmarkWidget to be leaked. To resolve the leak, define widgets.Bookmark.Bookmark in the top-level application.

I'm wondering if it's related to the "gray circle of death" which I experience intermittently when using the Bookmark widget.