Toad SQL app hangs when attempting to close the application after the client has been left connected to an SQL server, SQL server 2012, that has been power cycled. I was able to recreate this problem twice under same conditions on different days.
If for any reason connection to the server is lost (for example network problem - Ethernet cable is unplugged), Toad hangs on exit. Moreover, in this situation disconnecting from the server takes about one minute.