Shined up real nice.
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I'm guessing this is part of the redesign and not from the upgrade, but if you go to your profile page and hover the profile picture the caption is dark red and barely visible.
The problem is in line 23 in custom.css which changes the defined color from style.css in line 2381 which is white.
These are problems that have been around for a long time, both here and userstyles (but I guess you are done with uso?).
the problem is with markdown's <blockquote class="Quote" rel="someone">quoted text</blockquote>, not showing correctly. The line who said that - is missing.
<blockquote class="Quote" rel="someone">quoted text</blockquote>
-- this should show q1k said: Test
q1k said: Test
Writing with html selected has it's own problems too. Like multiline code not being formatted properly be it with <code></code> or <pre></pre>
French is fixed now. It was an escaping problem in a translation.