Make block appear on some pages but not others
I believe your only option is to use a PHP snippet to set the visibility.

Under Visibility settings select Pages on which this PHP code returns TRUE (experts only) copy and paste the snippet below. 

&lt;?php
if (arg(0) == 'user' &amp;&amp; !arg(2)) return TRUE;
?&gt;


For this to work you would also need to enable the PHP filter module.

Note that it's not generally recommended to use the PHP filter, but in some cases it might be the easiest solution.