Can you go to Edit Media, select the artist/album tags and check the values list for weird characters? if you see such values, rename them and try again. Remember to select "Clear cache" from client before testing. If you get error messages, please post them so I can take a look.
near ",": syntax error /usr/lib/ruby/1.8/sqlite3/errors.rb:62:in `check' /usr/lib/ruby/1.8/sqlite3/statement.rb:39:in `initialize' /usr/lib/ruby/1.8/sqlite3/database.rb:154:in `new' /usr/lib/ruby/1.8/sqlite3/database.rb:154:in `prepare' /usr/lib/ruby/1.8/sqlite3/database.rb:202:in `execute2' ./lib/db.rb:144:in `method_missing' ./lib/collection.rb:1366:in `values_for_tag' ./lib/collection.rb:1235:in `browse_category' ./plugins/1root.rb:56:in `browse' ./lib/plugin.rb:97:in `call' ./lib/plugin.rb:97:in `do_GET' /usr/lib/ruby/1.8/webrick/httpservlet/abstract.rb:35:in `__send__' /usr/lib/ruby/1.8/webrick/httpservlet/abstract.rb:35:in `service' /usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service' /usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run' /usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread' /usr/lib/ruby/1.8/webrick/server.rb:162:in `start' /usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread' /usr/lib/ruby/1.8/webrick/server.rb:95:in `start' /usr/lib/ruby/1.8/webrick/server.rb:92:in `each' /usr/lib/ruby/1.8/webrick/server.rb:92:in `start' /usr/lib/ruby/1.8/webrick/server.rb:23:in `start' /usr/lib/ruby/1.8/webrick/server.rb:82:in `start' ./knots.rb:44:in `initialize' ./knots.rb:394:in `new' ./knots.rb:394