Client used is very important in fixing issues.  Most of the following is in FF19, Chrome 25 or otherwise noted.

Issues broken down by type:

Responsive Design

Site clearly has responsive design.  I can view it at several differnet breakpoints in Firefox 19 on Windows 7. 

1280 v 600 (Landscape) = Fine

1280 x 600 (Portrait) = Broken Layout (Sidebars correctly display under main content, but broken)

1280 v 980 (Landscape) = Fine

1280 x 980 (Portrait) = Broken Layout (What's hot images bleed out of the side bar)

1280 x 800 (Landscape) = Fine

1280 x 800 (Portrait) Broken (What's hot images bleed in the side bar, same with calendar in sidebar)

1024 x 768 (Landscape) = Broken (Sidebar bleeds out, see above)

1024 x 768 (Portrait) = Broken (Sidebar has several issues)

360 x 640 (Landscape) = Broken

• Forums do not resize
• What's hot slider broken layout
• Social Media field blank

360 x 640 (Portrait) = Broken

• Forums do not resize
• What's hot slider not centered
• social media field blank

Gallery Thumbs shrink as expected, but with no max height or width exceed their normal sizing and become distorted.

The white boxes the thumbnails sit in on category level pages becomes uneven at some resolutions (IE - breaks).

Was unable to invoke the 'mobile' layout as expected on a iPoD Touch (4th Gen) or a Samsung mp3 Player (Android 2.3, stock browser).  Both got the desktop layout.

Firefox is picking up a global style for the paragraph element giving it a 10px bottom margin.  This really screws with the spacing on posts.  This is on like 547~ in bootstrap.css   Global styles are bad.

Usability

On a mobile device:  Clicking into the user name field works, select 'next' moves to password as expected, select 'next' moves to search box.  This should move to the login button.

On some Display breakpoints the Global Navigation disappears.  It is not very obvious that the box along the right side will display it.  The box has no marker or indication of function.

Page Structure

Quick scan of markup, by no means exhustive.**
**

• Invalid markup
• Conflicting Doctype and Syntax
• Meta Description is very broken on Forum pages
• Use of inline styles despite calling several external stylesheets
• Embeded Style tags, using commented out CSS toward the bottom of the page.
• Commented out JS code
• Use of JavaScript in a way that prevents MVC methodology.
• Calling lots of external JS, but still embeding some in the page.. in various places.