Yes, as far as I know everybody is having this problem. Facebook stopped the feed from fb pages a short while back - are you seeing the feed back again?
I don't have the mapped profile domains module so I havent tested codemirror with that. I'll get the module and take a look when I can.
Do you have a link to a mapped profile where code mirror is enabled but not working? I might be able to quickly see what's going on if I can see an example.
There are no dependent modules. If there were they would be shown as requirements under the module Info tab.
If you enter PatriaCo as the twitter username and your tweets do not appear in your feed then yes, you may have another module which is breaking your site, probably by throwing a javascript error.
When I enter PatriaCo and save your tweets appear immediately.