Hi all,
although I am sorry Core Update 164 caused such trouble, I am glad this thread boils down to the known issue with Talos IPS rules, and we are not dealing with another bug. 
Therefore, I am closing this as a duplicate thread. Please post additional things related to this issue here, so we can keep track of this bug in one place.
Thanks for your understanding, and best regards,
Peter MĂĽller