encoding and utf-8 exceptions after upgrade to Ruby 1.9.3 and rails 3.2

ever since I uploaded my new version to production from time to time I get encoding and utf-8 exceptions like these:

Encoding::CompatibilityError: incompatible encoding regexp match (Windows-31J regexp with UTF-8 string)

ArgumentError: invalid byte sequence in UTF-8

after seeing some post i added ot my application.rb

config.encoding = "utf-8"

What is it? and how do I fix? thanks


I had the same problem occuring "sometimes", I use now at the very top of each .rb files the following:

# encoding: UTF-8

class Whatever < ActiveRecord::Base

The problem occurs when the file contains one/several accent(s) (as a french guy, I sometimes use it in comments).

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