I also noticed that for the Roles node, if the Role Grants tab is visible, Toad is executing the underlying query twice for each role I click on. Same is true under tables for any RHS tab, when I click a new table, queries execute twice and screen refreshes twice.
This may be unrelated - sometimes under tables, when displaying Data tab, I’m getting a popup ORA-904 with User requested cancel of current query (I did not cancel anything). I can not reproduce this at will though.