linphone froze

[gregrwm]

login as user a
copied .Xauthority of user a to user b
launched linphone from user b
successful registration to sip2sip
did various work via firefox and ssh
call arrives, rings my cell, linphone strangely silent
click on linphone, window shows outline but nothing else
still will be sitting here a few hours if any questions..

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linphone 3.6.1-2.1build2
ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
Uname: Linux 3.13.0-27-generic i686
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: i386
CurrentDesktop: LXDE
Date: Sun Jun 1 17:23:36 2014
InstallationDate: Installed on 2014-01-30 (122 days ago)
InstallationMedia: Lubuntu 14.04 "Trusty Tahr" - Alpha i386 (20140129)
SourcePackage: linphone
UpgradeStatus: No upgrade log present (probably fresh install)