When I initialize Wirble (0.1.3) directly in IRB with the following lines, it works well; I get colorized output, auto-complete etc.
require 'rubygems'
require 'wirble'
Wirble.init
Wirble.colorize
When I put the same lines into .irbrc, I get a prompt that looks like this:
>>
OK, the answer is in the Wirble documentation. You initialize Wirble as follows: