This problem was encountered on OSG and reported by Alain Roy...

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In the PBS jobmanager script, used by both GRAM 2 and GRAM 4.  When it
constructs the PBS submit file, there is a potential problem. 
It puts the environment variables into a PBS directive, like this:
#PBS -v var1=val1,var2=val2...

All versions of OpenPBS and PBSPro limit that line to be 2048 characters.
Torque limits it to 32K.  If it's longer, it breaks the submission, in a
variety of ways. 
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The scripts should add a MAX_ENV_LENGTH parameter and test the constructed env
length before submitting the job.  A job exceeding the length should be failed
and return a message.  Something like "Local Resource Manager environment
directive max length exceeded.  job length submitted was (4000) max length for
PBS is 2048)."