Little dots automatically fill the password field
On my iMac I have three accounts, mine, my wifes, and a guest account. When the system is at the login screen, if I click my icon to log in, the password field starts filling up with "characters" (dots) all on it's own. I have to hold the delete key, at which time it erases and I can then enter my password. But... This only happens if my wife was the last one to log in. If I had last logged in, no dots.
If I allow it to run like this for 5 or 10 seconds, it fills up with so many characters that it becomes time-consuming to get back to an empty password field.
Any ideas? Obviously, any sort of malware that could be running at the login screen would be bad, very bad.