Hi Damian Slee,
Unfortunately without a project where we can reproduce this issue we are unable to help you.
We had such problem with previous versions but is was fixed some time ago. So we cannot reproduce it anymore. This is why I am asking you to provide a project where we can reproduce it.
Also, I want to check that the assemblies version is correct 2010.1.422.1030
as well as the Silverlight version - 3
not 4 and that there are no strange margins in your startup page (.html or .aspx).
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items.