Thank you for your report. I have not a mac to solve this problem. If I will have time I’ll install the hacked mack on vitrual box and look at it. But you can help me to find the problem.
I see the stack trace above that registering servlet is OK. So, problem in the next call - showFrame method. Please open file VaadinE4Application and set breakpoint into first line of showFrame method. Then trace step by step this method and find the call with hang. If you have no time fo this opertaion, I can send you the version with log tracing.