Comment 1 for bug 402892

You don't have to restart your computer. You can switch from graphical tty to a console tty, login then kill the process of rapidsvn then switch back to graphical tty.
To switch between tty, you can use Ctrl + Alt + Fx (x = 1, 2, 3, ...). Usually, graphical tty is Ctrl + Alt + F7 :)
You can try this command to kill rapidsvn process

kill -9 `pidof rapidsvn`