We know there is an issue regarding the duplicated IDs which is a result of the upgrade process. However we managed to resolve the problem - I have attached an archive containing sample code that you have to run.
contains a simple ASPX page, which you have to include in your web site and
visit through the browser. The code changes IDs of all controls found in your
database. Please make a backup before executing it, just in case. Also, have in
mind that it takes a while to execute because of your large database.
We tested it on the database you have provided and it seems to solve the
problem. Let us know if you have any other issues.
All the best,
the Telerik team
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