Using Google Chrome 9 on Linux, edit any wiki page using Rich Text Editor, copy and paste any formatted text, then switch to Wiki markup, and the markup is mangled. This does not occur in Firefox 3.6.13 on the same system, so safe to assume it is Chrome or WebKit-specific.

Copied text:

running {{rsync}}

Pastes as:

 running {{rsync }}

Copied text:

h1. Foo

Pastes as:

h1. {color:#003366}{*}Foo{*}{color}