The bug is that an error would be raised while attempting to convert a
template from one encoding to another.
Please see http://redmine.ruby-lang.org/issues/5564 for more details.
The workaround is to load all conversions into memory ahead of time,
and will only happen if the ruby version is *exactly* 1.9.3p0. The
hope is obviously that the underlying problem will be resolved in
the next patchlevel release of 1.9.3.