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Looks like issue is a bug where changes made on the ASDM appear to save but actually aren't - https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvt41763. Mentions time but applies to any settings in system policy. Cisco's recommended version is 6.4.0.7...
https = all the traffic is encrypted so I can't really tell much from packet captures. However, I can see traffic hitting the sfr from the PC running ASDM - see this in tcpdump on sfr and wireshark from PC side. But again, I can't really see anything...
I'll keep playing around with it...ASDM is Java so maybe there's a debug setting in Java console or some other way to capture more advanced logs...not a Linux expert but since this is basically Cisco branded linux, I'm guessing there are ways to log ...