Thank you for participating in the Slingbox Answers Forum. I would highly recommend updating the Slingbox, because this helps with the life of your Slingbox and how it works. You shouldn't run into any issues with viewing the Slingbox, longs the Slingbox is setup on the home network. Below I have included an informational link for you to look at in regards to why it's important to update the Firmware of the Slingbox. If you do run into any problems after updating your Slingbox, please feel free to contact us via our Chat Support or Phone Support at 877-467-5464.
Hope this Helps.
The Sling Moderation Team