“According to Linden Lab’s policy here http://secondlife.com/corporate/tpv.php
On the 30th of April you will not be allowed to connect to the SL grid unless you use a TPVP complaint viewer.
You must download and use Emerald version 1634, please install it from here http://modularsystems.sl/downloads.html
Use of version 1634 puts your viewer in complete compliance with the TOS and the TPVP, so you can continue to enjoy Emerald far into the future.”
Download of new compliant viewer is available here