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This a very important matter and that's why I am cross-posting here from this post
With jQuery 1.5, remote validation used by the plugin jquery.validate.js was broken
They have now a fix here that has solved the problem.
However, even with this fix, it seems there is still an issue here when you use grid editing features.
telerik.grid.editing.js uses heavily jquery.validatation
and if you have any remote validation beside this file, it will fail.
See also my other post
With jQuery 1.5, remote validation used by the plugin jquery.validate.js was broken
They have now a fix here that has solved the problem.
However, even with this fix, it seems there is still an issue here when you use grid editing features.
telerik.grid.editing.js uses heavily jquery.validatation
and if you have any remote validation beside this file, it will fail.
See also my other post