The version of Toad Data Modeler, 220.127.116.11, takes a long time to shutdown (approximately 30 - 45 seconds).
This occurs when trying to shutdown from either of the methods below:
1. File | Exit
2. Clicking on the X button in the upper right hand corner
With Task Manager open, the Application tab shows Toad Data Modelers status as 'Not Responding' and the CPU Usage: around 50%.
It stays for about 30-45 seconds and then eventually disappears or shuts down.
Waiting for fix in a future release of Toad Data Modeler.