Responsive Version 1.8.6 is now available:

Update: I received several questions about the font size changes and why? Main body font size is unchanged, however for semantics reasons heading sizes are increased and margins changed. Widget wrapper font size was removed completely because it was in conflict with plugins, forms and everything else we place in our widgets and having font size on the wrapper will change the sizes to overall area.

If you want you can still place the following back to your style.css and/or Theme Options > Custom CSS

.widget-wrapper {
     font-size: 13px;
}

and also the old headings:

h1 {
    color: #404040;
    font-size: 2em;
}

h2 {
    color: #777;
    font-size: 1.6em;
}

h3 {
    font-size: 1.5em;
}

h4 {
    font-size: 1.3em;
}

h5 {
    font-size: 1.2em;
}

h6 {
    font-size: 1em;
    text-transform: uppercase;
}

Changelog Legend:

[+] = Added
[*] = Changed
[^] = Moved
[=] = No Changes
[x] = Deleted
[!] = Bugs

(12/23/2012) - Maintenance and Improvements - Version 1.8.6
[+] Localization
    - responsive.pot
    - Languages improvements 
    - New Languages (40 total)
    - Arabic
    - Estonian
    - Hindi
    - Korean
    - Turkish
[+] If statement for breadcrumb lists and code formatting 
[+] Breadcrumb lists to Blog and Blog Excerpt Template
[*] CSS Improvements
[*] Twitter Icon to comply with https://twitter.com/logo guidelines
[*] New screenshot.png for Retina displays

New changes should not affect your site, however as always I need to remind you that all Theme customizations must be in form of a Child Theme http://themeid.com/forum/topic/505/child-theme-example/ otherwise everything you changed will be overridden and returned back to default version.

Thank you so much for using Responsive, for your donations and for being patient with us.

Happy Holidays from ThemeID Team!

Emil