Brief.
We have made a fix in user_profile.php after release 3.0 has been issued on February, 21.
All downloads starting from February, 28 don't contain this bug.
Description.
There was a bug like:
Notice: Undefined variable: email in /user_profile.php on line 522
Solution.
Please download updated version of the file from here
http://www.viart.com/downloads/user_profile-3.0.zip
Then extract file user_profile.php into the root folder of your shop replacing existing one.