Hi,
Does your KSS 9.6.1 enable "Inputs>TCP"?
KSS 9.6.1 was stopped with same Error by receiving TCP.
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2017-07-10 10:14:16 *** INTERNAL PROGRAM ERROR - Please contact http://www.kiwisyslog.com/support/ ***
2017-07-10 10:14:16 Service Version =9.6.1.6 | Error Number: 13 | Description: Type mismatch | Module Name: Syslogd.frm | Procedure Name: ParseMessageQueue | Line Number: 420 | Date and time: 2017/07/10 10:14:16
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When only "Inputs> UDP" is enable, KSS 9.6.1 is running without problem.
So, KSS 9.6.1 has a problem receiving TCP logs, I think.