When the DBA user locks one table for bulk loading, other connections are locked out of the entire database. Toad for Data Analysts 2.7 which then returns an error message, greying out the Object Explorer with error message: "Disabled due to a detected server lock' and a button showing "Retry"
There is an uncommited transaction for the current connection, which needs to be commited or rolled back
WORKAROUND:
Check if auto-commit is turned off. (Check the bottom left corner of the Toad window).
If it's turned off and there are uncommitted transactions for the current connection, manually commit/rollback the transaction - there are two additional buttons in that corner which enables this.
