Cannot build .exe from windowed .rbw Ruby script

[Norm Haberly]

I'm trying to package a Ruby 1.9.3 windowed application using ocra 1.3.4. When I run "ocra myapp.rbw", the myapp.rbw windowed application is launched and ocra hangs with the message "=== Loading script to check dependencies". I have to terminate the windowed program before ocra continues. I thought this might be a problem with my program but I experienced the same problem when I tried to package an example FxRuby program, tabbook.rb. Ocra does NOT hang with any console app I've tried, i.e. console apps work just fine. When I terminate the windowed app, ocra continues but eventually abends with the message "You may have encountered a bug in the Ruby interpreter or extension libraries". I think this message is misleading because the last mentioned gem file before the error message varies depending on the Ruby script I'm trying to package. If I surround the start-up code in my windowed app with "if not defined?(Ocra) ... end", then the windowed app is not launched when I try to package it with ocra and an .exe file is created --- but the .exe file does not run when I double-click it (because of the "if not defined?(Ocra)" code). Is is a bug in ocra that ocra hangs until I close the windowed app or am I doing something wrong? Any suggestions for how I might troubleshoot the cause of this problem? Thank you!