I'm sorry but it appears that you have been experiencing this known issue
. You can download our updated Safari extension from the comment section of the previous link (or see WebUI.zip attachment) and place it into the '..\Telerik\Test Studio\Browser Extensions\Safari\' folder before manually installing it.
Another option would be to upgrade Test Studio to version 2012.2.1527 which is our latest internal build and contains the same fix mentioned above. The LIB can be downloaded
directly from your account or as an upgrade from the current version after configuring your Installation and Update Notification settings accordingly (see attached image).
the Telerik team