Please edit the /modules/mod_sclogin/tmpl/login.php file.
Around line 70, you'll see a line of code that looks like:
echo '<div id="login-modal" class="sourcecoast hide modal fade" tabindex="-1" role="dialog" aria-labelledby="login-modalLabel" aria-hidden="true" style="display:none">';
Please remove the word 'hide' in the class=".." section so it looks like:
echo '<div id="login-modal" class="sourcecoast modal fade" tabindex="-1" role="dialog" aria-labelledby="login-modalLabel" aria-hidden="true" style="display:none">';
That change will be in the updated SCLogin release, due out at the end of this week as well.
I hope that helps,
Alex