I have the Object Explorer to be set to view as a Flat Tree explorer. I can see my specific tablespace when I select the space usage tab and see the correct list of tables in that tablespace selected. However, if I click on indexes, there's nothing. Seems like it's missing.
Upgrade to the latest version of Toad for DB2 to fix the issue. Download at https://support.quest.com/Search/SearchDownloads.aspx
Affected Database versions are LUW 9.7 or higher.