I have installed 1.10.X b2evo and also Autoblog - opted for stub for clean URL
The users specific directories are created with index.php in it but while calling (e.g. "blog.mydomain.com/user1") does not work. The browser showing error 500 Server Error - A misconfiguration on the server caused a hiccup
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Your question may already have been answered in the [url=http://forums.b2evolution.net/viewtopic.php?t=8146&highlight=plugin+autoblog][Plugin] Autoblog[/url] section of this forum.
Good luck