Exchange 2013 CU1 OWA and Lync 2013 Integration

I had Integration between 2013 OWA and Lync 2013 working fine...until CU1 for Exchange 2013 was applied.

I've checked the setup by following http://memphistech.net/?p=280 andhttp://technet.microsoft.com/en-gb/library/jj688055.aspx, which are the same guides I used to set it up originally, and everything is correct.

I don't get any errors client side, or in the MBX event log or in  C:\Program Files\Microsoft\Exchange Server\V15\Logging\OWA\InstantMessaging

In OWA there is no mention of IM in the user name area, just as if Lync integration hadn't been applied.

Anyone else experienced this, or any ideas?