Git Windows Command Prompt gets stuck during Git commands with (END)

I've got Git for Windows setup (msysgit) and it was working fine for the last few days and today I've encountered an odd error.

When issuing a Git command in the Windows Command Prompt or in the Git Bash that comes bundled with msysgit, I get a strange '(END)' line appear and then I cannot issue any other comamnds.

At this point all I get are system beeps.

Any ideas?

Thanks, P.