To answer your questions and suggestions in turn:
- I'm using version 9.13 and the Win32 binary gui
- I don't think I've done an update recently; though there may have been some automatic updates that I don't know about. I did notice after my post that Windows XP was getting slow and jerky and when I tried to reboot there was an error message that cmd.exe was not responding. I've cleaned up the registry with Uniblue registry cleaner and it has happened again.
- I'm afraid I don't know the syntax for using the mobi2mobi from the cmd prompt. Could you point me to instructions for this please?