I reviewed the email I received from TAC and you are correct. I misread it the first time. 6.6 does have the fix so you could upgrade to that if you wanted.
Don't upgrade your 1140s to 6.4.0.8. There is another bug that prevents 4.8 Anyconnect clients from connecting to a 1000 series device. You will need to downgrade your firewalls or all clients to 4.7 Anyconnect. The bug CSCvs9189 is a brand new bug a...
I also have this problem. Two customers are having issues with Anyconnect not working after around the two week mark. Just performing a failover will resolve the issue. I have a TAC case created and I am working with them on that. This bug has occurr...