prepended input icons appear offset with the latest update 2.0.1

[J]

Hi,

is it just me or does the latest update (2.0.1) result in the prepended 
input icon being slightly offset? I've even copied the example wholesale 
from http://twitter.github.com/bootstrap/base-css.html#icons with the same 
result? When I switch back to 2.0.1 (clearing cache etc.) the 
offset disappears...

        <div class="control-group">
          <label class="control-label" for="inputIcon">Email address</label>
          <div class="controls">
            <div class="input-prepend">
              <span class="add-on"><i class="icon-envelope"></i></span>
              <input class="span2" id="inputIcon" type="text">
            </div>
          </div>
        </div>

J