Thank you for posting! Windows XP is no longer a support operating system and could cause numerous issues while using the Watch website on Slingbox.com.
Here is an article that further explains what is supported by Watch on Slingbox.com
If you have any other questions, feel free to respond or call us at 1-877-467-5464. We are open seven days a week, 10:00am to 10:00pm EST.
The Sling Media Moderation Team
I suspected that may be the case, and posted here so that anyone else having a similar problem would be aware. For the moment, I still only have 2 Windows XP computers I can use to watch my Slingbox. Will probably buy a new Windows 7 machine at the first of the year, when I return to the States. I hope I can get by with what I have until then. Thanks for confirming my suspicions.