This is happening,because Admin CP is connected to Btiteam site.The site is down and tracker can't load news from btiteam.org.You have to wait much longer.Another option is to change few lines in admin/admin.main.php
Code:
if(get_remote_file("http://www.btiteam.org"))
{
$btit_url_rss="http://www.btiteam.org/smf/index.php?type=rss;action=.xml;board=83;sa=news";
$btit_url_last="http://www.btiteam.org/last_version.txt";
Try to change URL with whatever you want.This works for me.