Hi, I have just upgraded our company’s blog from 1.5.2 to 2.0.1. Everything semt to have worked smoothly.
But then one of my colleagues wanted to change his password and could not even log in. I checked his entry in “Authors & Users”. Everything looked alright, so I tried to change the pwd for him. When I tried this, I got an “This username is invalid. Please enter a valid username” error.
After playing around a bit I found that all usernames containing umlauts (äöü) are treated as being invalid by WP 2.0.1. Now I don’t know what to do. Please help me out.
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