[sldev] freeze before login screen

[Robin Cornelius]

>  Check for the presence of the skins/html/ sub-directory in your build: this directory fails to be made part of the install by scons in v1.19 builds (normal and windlight viewers). If it is not there, simply copy it from an official release of the client.
>

I am pretty sure this only stops the spinning hand logo from
appearing, i am sure the lock up is mozilla related and as the web
logon is backed out the UXI form should still be able to appear.
Unless mozilla has some crazy timeout and is blocking.

Robin