I want to make sure I understand the problem... you're saying the Actions.InvokeScript never returns? I can't imagine how that's even possible. I've never seen that happen before. When you run into the problem does it happen every time or is it intermittent for that one test?
Can you send me a test I can run locally that reproduces this symptom? I'd like to reproduce it and investigate what's going on.
the Telerik team