If it's working fine on one machine but not another, it doesn't sound like your code is to blame. How many other machines does this work on/fail? You might have an issue with certain hardware/drivers in that failing machine.
Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.
NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined
objects and unknown namespaces.