Typically when this issue occurs, something interrupted the communication between the CalData.PGO file and QVS.exe. So would ensure that all QlikTech/QlikView directories and file types (including .PGO) are excluded from any anti-virus or other real time scanning applications. If you have a backup of the CalData.PGO file, you should be able to restore it to recover the CAL assignments. Another note, the QVS build version you listed is very old and improvements to .PGO file stability has been included in the later versions of QlikView.
If you need further assistance, suggest you reach out to Qlik Support.
Hope this helps,
Chip
Principal Technical Support Engineer with Qlik Support
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