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Sorry, but that is incorrect. PEMPro always saves to disk after each write to the log file in case there is ever a crash. I suspect that SGPro does something similar.
In PEMPro's case, there are two log files: the log file with all of the data points collected up until that point, and another log file with low-level debug information. They will never get deleted by PEMPro so if you can locate them and attach them here or on the CCDWare/PEMPro forum, I will try to determine what happened.
-Ray