I'm sorry to hear that you have problems with our new release.
Indeed we have a lot of tests for every component covering various component layers including data, UI, automation, etc. to make sure that everything will work as excepted during our releases. Furthermore we have various applications (internal and public) with our components including our Testing Tools, Team Pulse, JustCode, Telerik Reporting, etc. and all these are updated to the new versions of the components every release - we are definitely trying to make sure that everything will work smoothly.
We are trying also every time to provide a Beta version before the official release in order to make sure that our customers will not hit any problems during official release upgrades. With every Beta also we provide a full release notes - you can usually check them here.
We believe also that with this release our RadGridView is now one of the fastest grids on the market (even compared to standard Silverlight DataGrid) and we didn't introduced any breaking changes in our API and/or templates.
Have you tried our Q1 2011 Beta before upgrading to our official release? I've checked your account however didn't noticed any communication related to any Beta issue.
All the best,
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!