Redmine

I've just upgraded to Redmine 0.7.devel.1787 (MySQL) and I getting the error below on a number of pages.

It is only occuring for users that don't have their timezone set (which is the default).
The only way to fix the problem is to manually modify the value in the database as the error occurs on the My account page.

ActionView::TemplateError (undefined method `utc_to_local' for Wed Aug 29 07:12:47 UTC 2007:Time) on line #4 of my/_sidebar.rhtml:
1: <h3><%=l(:label_my_account)%></h3>
2: 
3: <p><%=l(:field_login)%>: <strong><%= @user.login %></strong><br />
4: <%=l(:field_created_on)%>: <%= format_time(@user.created_on) %></p>
5: <% if @user.rss_token %>
6: <p><%= l(:label_feeds_access_key_created_on, distance_of_time_in_words(Time.now, @user.rss_token.created_on)) %>
7: (<%= link_to l(:button_reset), {:action => 'reset_rss_key'}, :method => :post %>)</p>

app/helpers/application_helper.rb:98:in `format_time'
app/views/my/_sidebar.rhtml:4:in `_run_erb_47app47views47my47_sidebar46rhtml'