I have a strange situation here:
From time to time I cannot log in with any of my mysql users. I even cannot make a mysql dump.
So I started searching in mysql files and I found that
users.MYI are modified in the time when the login problem occurs.
The only way to return everything to work is to restore the
users.* files from the time when the system was running okay.
I searched about the problem and I found that there was some bug in the MySQL, but it was in the older versions (4.X). I'm running 5.5.
Any ideas? Thanks!