that would be a good idea. If it complains that another instance of the program is still running - open the task manager (ctrl-alt-del) - and kill the UB client, and then start it again.
If that doesn't work, reboot.
When you start the client again, it should put you right back on the table.

Don't feel too bad if you loose it because of this. Sooner or later you'll win a heads-up this way.