Well, it is working , sort of. If I reboot with IPS enabled, I get no internet access through proxy and no site-to-site SSL until I disable IPS. Then I can enable IPS again and it works.
Is there anything in the ips.log? This could be very helpfull ... also which policy is running, is the IPS running in ALERT mode or DROP mode (>>webadmin>>network security>>intrusion prevention>>policy) ?
For me, it was set in drop mode... same settings as in 7.911. Interestingly, there were no log entries to be found when I discovered the issue. I guess I'll try re-enabling IPS to see if I get some.
Hmm... it's working now... the system has since updated to pattern 12473. Interesting tidbit... I seem to recall log entries being created when IPS is disabled (in the IPS log)... not seeing that, it just dies silently... I do now see entries when it starts though.