I downloaded the 2011.3 1116 release of Rad Controls for Silverlight and WPF and our property grids are now throwing unhandled Index Out of Bounds Exceptions. They are auto-generating column definitions and this happens when the Item has changed on the Property Grid. The only way I can get it to not crash is by manually clearing the PropertyDefinitions collection before binding. This isn't too much of an inconvenience, but I thought I'd let you know since it appears to be trying to clear the collection and failing at it.
If you'd like a sample project demonstrating this, I can provide one.
If you'd like a sample project demonstrating this, I can provide one.