Open the IM configuration for the "controller" probe on that robot, and go to the "Setup" > "Environment" tab, do you see a Variable defined for "LD_LIBRARY_PATH"?
If defined, check that it includes the path to the Sybase library folder.
It should look something like the following example:
LD_LIBRARY_PATH: /opt/sybase/ASE-15_0/lib:/opt/sybase/DataAccess64/ODBC/lib:/opt/sybase/DataAccess/ODBC/lib:/opt/sybase/OCS-15_0/lib:/opt/sybase/OCS-15_0/lib3p64:/opt/sybase/OCS-15_0/lib3p:/opt/sybase/ASE-15_0/lib:/opt/sybase/DataAccess64/ODBC/lib:/opt/sybase/DataAccess/ODBC/lib:/opt/sybase/OCS-15_0/lib:/opt/sybase/OCS-15_0/lib3p64:/opt/sybase/OCS-15_0/lib3p
Also, these environment variables need to be defined in the robot.cfg (controller) -> "Environment' section of the configuration.
For example:
SYBASE: /opt/Sybase
SYBASE_ASE: ASE-15_0
SYBASE_JRE_RTDS: /opt/sybase/shared/SAPJRE-7_1_011_64BIT
SYBASE_OCS: OCS-15_0
SYBASE_WS: WS-15_0 SYBROOT: /opt/sybase
One of these environment variables being missing or pointing to the wrong location would be the most likely cause for it failing to start.