Unfortunately, some serious bugs have slipped into Chicken 2.0b1. I don't recommend upgrading to it unless you're very adventurous.
The issues are present both for users who have never before used a version of Chicken, and who are upgrading from 1.3.6.
For more info, take a look at the bugs that have been posted since 8/18/04.
Sorry to getcha all riled up!