SlingProjector projection region is always 640x480
If you find that the projection region that SlingProjector wants to use is always 640x480, instead of other resolutions that might be more appropriate for your computer, then you need to update your version of the SlingCatcher Desktop software: this issue has since been fixed.
You can download the update from the Sling Media website.
What's in the SlingCatcher December 2008 Software Update? The SlingCatcher December 2008 Software update includes a number of improvements for SlingCatcher, My Media, and SlingProjector. There is also a new BETA application: SlingSync.