For some reason in Slackware 10.2 one can no longer log in as a regular user, <code>su</code> in a terminal (ex. xterm) and run graphical apps such as the seamonkey or mozilla installer.<br />
<br />
An example of the error you get is:<br />
<pre>Xlib: connection to &quot;:0.0&quot; refused by server
Xlib: No protocol specified

(seamonkey-installer-bin:6410): Gtk-WARNING **: cannot open display:</pre><br />
The solution to that is to run <code>xhost +</code> before doing the su:<br />
<pre>$ xhost +
$ su -
$ seamonkey-installer-bin</pre><br />
Once i figure out a way to have this setting permanent, I will post it here.<br />