I can type the password...

[aicul]

This is a strange one:

Every time I need to enter an administrator user/password (like for example to install software), the Keyboard viewer automatically appears when the login window is presented.

This has started since about a week, it is a real nuissance and I would like not to have this happen.

I have 10.5.3 and have not installed OS related upgrades for some time now.

Any ideas welcome...