This has been happening all of a sudden on 5 different computers we have (all windows 10 pro) using LastPass Enterprise. The icon will just disappear and when you check the extension, it is turned off, When/if you enable the extension, the icon returns, but you can not use it. You have to uninstall and reinstall, then it works fine for a day or two. We have also noticed that even if you can log in the select a link to launch in LastPass, it will not pass the UN ro PW to the link.
We have used LastPass for year sand it has been very stable. In the last 6 months this is becoming unbearable and not sure why their support does not respond. I have sent support requests for help and have not heard back. Perhaps they have not kept up with changes in Chrome and it is conflicting. We have disabled Chrome password manager BTW and it has not made a difference.
I hope they figure it out, or we will need to change .