Have you eventually set an editable CellTemplate for the column? If so, then you may not enter edit mode easily.
May I ask you to isolate the issue in a demo solution illustrating it and send it to me? You can take a look at this blog post for a reference on how to isolate an issue.
You can open a new support thread and attach the project there.
Check out Telerik Analytics, the service which allows developers to discover app usage patterns, analyze user data, log exceptions, solve problems and profile application performance at run time. Watch the videos
and start improving your app based on facts, not hunches.