12.19.07
Merb on Cygwin: merb_activerecord is not compatible with ActiveSupport 2.0.2
If when starting merb you get errors that active support 2.0.1 cannot call activate when active support 2.0.2 is already loaded - this is probably because you are using merb_activerecord which is tied to 2.0.1.
Execute:
$ gem list activesupport
To confirm that you have 2.0.2 and 2.0.1 and, if you desire, resolve the issue with:
$ gem uninstall -v 2.0.2 activesupport