If a form lands in the _Error queue on Mi-Forms Server, are the data and image lost? Can we do anything to recover this? Is the PGC file stored somewhere for recovering once we clear the error?
If the session is in the _Error queue on Mi-Forms Server, data is not lost. The session in the queue is the actual session created during the process from the PGC file. In many cases, you can simply move the session to the _Incoming queue so it attempts to reprocess.
If you have a session, you would not need the PGC files any longer.