Just like to report a UI issue for Safari for Mac 4.0.3 in Sitefinity 3.7 SP1.
When you use the insert link dialog in RadEditor the dialog UI appears as per attached. Other dialogs eg insert image appear to be fine.
Curiously I get the same sort of UI issue in this forum "new thread" Editor I am typing in at this very moment on Sitefinity.com
Hope this helps.