EXC13 cu7, Lync 2013 last updates OWA integration error

Hello, 

we have 3 cas and 3 mbx exc13 cu7 environment

when a user from a specified database tries to log on OWA IM through OWA he can't 

if we move mount the database to another mbx server it works fine

all users (where their databases are mounted at mbx2) are getting this error

I used this article

http://blogs.technet.com/b/jenstr/archive/2012/10/31/troubleshooting-tips-for-exchange-2013-owa-im-integration-to-lync-2013.aspx

 and we got nothing new 

always the same error on IM logging at mbx \ v15\logging\owa\ logs 

2015-04-13T14:48:18.774Z,102,5,,,,0,DEBUG:Globals.Initialize: Initialization failed.,

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