Running the 6.3 beta (which btw shows 6.0 in the help/about screen). Database Explorer, choose information_schema as database, choose tables tab... no objects displayed.
Running 220.127.116.113, perform same steps and folder System Objects displays and when expanded the tables are displayed.
I searched around in the tools/options settings, but found nothing that seemed to apply. I know some other tools (MySQL Workbench) allow not displaying the metadata schema, but can't find how to allow it in Toad4MySQL beta.