Very frustrating! Same happened for me. I had to kill the process as it was just opening window after window each saying the same thing. Mooney went on though and after closing around 30 IE windows I was more than happy!
This also happened to me. Was slightly worried that my money had been taken 30+ times too but on logging back in I can see only the one credit so now just got to wait and see whether the system will be working to spend it on Saturday!