Boost makes the editing of content/settings impossible
Did you add the Boost section in your .htaccess, which is necessary to make it work? If you already have, you might check that the part about GZIP is present.

I had this same problem, and what I did was to disable and uninstall and remove the Boost module. Then I installed and enabled the previous Boost version where this GZIP section is present. I saved that part in .htaccess and went back to installing the latest Boost version again, but with the added GZIP part in the .htaccess file.

You can also check this thread out: Impossible to edit nodes, log to in etcetera after enabling Boost and editing .htaccess

The most important gzip rules are these (if you want to try this without disabling, uninstalling and the re-installing the module:

  # GZIP
  RewriteCond %{HTTP:Accept-encoding} !gzip
  RewriteRule .* - [S=1]

  RewriteCond %{DOCUMENT_ROOT}/cache/%{ENV:boostpath}/%{SERVER_NAME}%{REQUEST_URI}_%{QUERY_STRING}\.html\.gz -s
  RewriteRule .* cache/%{ENV:boostpath}/%{SERVER_NAME}%{REQUEST_URI}_%{QUERY_STRING}\.html\.gz [L,T=text/html,E=no-gzip:1]


Hope this helps.