This KB describes a possible reason for jobs staying in the Proof Client queue with the status "Processing".
The job arrives in the Proof Client queue and stays in the queue with the status "Processing".
All incoming jobs are stuck with the same status.
In the Proof Server log you will see the following info for that particular job (when the debuglevel key is added to the SYS_0000.xml file).
10/05/2017 13:56:34.791,522,2000,4484,Server,PASWPROOFP01,[JobMgr 134] starts analyzing job
10/05/2017 13:56:35.166,523,2000,5184,Server,PASWPROOFP01,[JobMgr 134] starts preview calculation
10/05/2017 13:56:35.182,524,2000,5424,Server,PASWPROOFP01,[JobMgr 134] preview calculation is finished
10/05/2017 13:56:35.197,525,2000,5424,Server,PASWPROOFP01,[JobMgr 134] starts output calculation
10/05/2017 13:56:35.229,526,2000,5424,Server,PASWPROOFP01,calculateOffset margin_mmXY=(3.0, 3.0), offset_mmXY=(0.0, 0.0)
10/05/2017 13:56:35.291,0,3000,5928,EpsonPrn,PASWPROOFP01,Initialize (First Job)
Image cropped and StopOnCrop flag set, aborting...
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