I know there have been allot of threads on G penalties lately but I really have not seen many that focus on internal factors. Just recently there was a thread on "Possible Causes of Google Penalties", that I found very helpful, it listed factors such as:
-- Buying links (maybe - not sure)
-- Un-natural backlink profile.....
-- Linking to bad neighborhoods
-- Being part of a network of interlinked sites
These are all great, but can we all come together and share more internal experiences that have caused penalties? For example:
-- Changing internal navigation structure
-- Changing site templates
-- Having no-follow tags to affiliate links
-- Deleting wordpress Tags (possible over optimization)
-- Modifying Title, Descriptions...
-- internal 301 redirects?
Any experience you have had by changing internal stuff on your site and it caused a penalty, please share.