Redmine

After upgrading from 1.2.2 -> 2.2.3 there seems to be some kind of ui problem. The default Ticket Filter is active but on the Frontend nothing is displayed in the Filter section. Trying to add a new Filter gives no results either (nothing happens). Same for Edit Previews of all kind (tickets, wiki, etc). The Thin and Redmine logs look clean, everything else is working as expected.

About your application's environment
Ruby version 1.9.3 (x86_64-linux)
RubyGems version 1.8.24
Rack version 1.4
Rails version 3.2.12
Active Record version 3.2.12
Action Pack version 3.2.12
Active Resource version 3.2.12
Action Mailer version 3.2.12
Active Support version 3.2.12
Middleware Rack::Cache, ActionDispatch::Static, Rack::Lock, #<ActiveSupport::Cache::Strategy::LocalCache::Middleware:0x0000000321f748>, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, Rails::Rack::Logger, ActionDispatch::ShowExceptions,
ActionDispatch::DebugExceptions, ActionDispatch::RemoteIp, ActionDispatch::Callbacks, ActiveRecord::ConnectionAdapters::ConnectionManagement, ActiveRecord::QueryCache, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ParamsParser, ActionDispatch::Head, Rack::ConditionalGet, Rack::ETag, ActionDispatch::BestStandardsSupport, OpenIdAuthentication
Application root /opt/redmine-2.2.3
Environment production
Database adapter mysql2
Database schema version 20121026003537