[Xymon] logfetch unreliable?

I am in the throws of replacing a commercial monitoring product with xymon. (Before this product we ran big brother. )

But I am in a pickle. The commercial product picked up a log entry last night, that xymon did not. I know this because both products are alerting currently. My biggest issue is the non-report is not reproducible. If I send test messages into my fake log, it works - but I have proof it failed last night in the real log file. How do I even go about debugging this?

My client-local.cfg has

[nemo] log:/var/log/fake.log:1024 trigger "Notify Mainframe On-Call." log:/var/log/rmsupload.log:1024 trigger "Notify Mainframe On-Call."

G