Sorry for the late reply. I did a test - upgraded 2011.1.503.2 to 2011.2.520.2, but I didn't loose any of my custom templates. I am really sorry that you have lost your templates. We will release an internal build soon, so could you please backup your template definitions and send them over if you loose them again.
Thank you in advance for the assistance.
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?
Telerik Public Issue Tracking
system and vote to affect the priority of the items