I understand that you are having some issues when connecting to your Slingbox PRO HD, since the application crashes. However, the application works fine on any other supported device (including iPhone and iPad applications).
Even though this is not a common error message, it seems that the issue is related to the web browser in use on that specific computer. If the issue was related to the Slingbox, you would get the same behavior on all of the other devices.
With this in mind, I recommend you to check both of the following links in order to know the requirements for the Slingbox PRO HD and the supported web browser versions.