Unfortunately I wasn't able to reproduce an exception but I have some advices for you:
- The RadGridView doesn't work very good when it is measured with infinity so I'd advise you not to use it inside a stackpanel (use grid instead).
- When you use it inside a RadTileViewItem you should set MinimizedColumnWidth/Rowheight so that it won't be measured with infinity.
- You can also try to disable the RadTileView animations by setting the IsItemsAnimationEnabled to false.
I've attached the sample project that I used for testing so you could examine it.
If after trying my suggestions you still have problems with the tileview and the gridview I would like to ask you for some code snippets.
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