I am running Cadence 5.1.0 on a Solaris 10 machine.
It looks like you are picking up shared library files from a Cadence IUS (Verilog) install rather than from your Cadence install. Notice that the path is pointing to a cadence/ius/0611USR3 version. You need to update your LD_LIBRARY_PATH environment variable to have the Cadence shared library path first when running icfb.
In a shell window:echo $LD_LIBRARY_PATH
In Bourne/Korn/Bash:export LD_LIBRARY_PATH=$CDS_HOME/tools/lib:$LD_LIBRARY_PATH
In C-Shell:setenv LD_LIBRARY_PATH $CDS_HOME/tools/lib:$LD_LIBRARY_PATH