Hi @johnbillion ,
I’m also facing the same issue. Switch back to link is not showing with the latest version of the Jetpack plugin. The issue is gone as soon as I deactivate the jetpack.
I tried to debug the issue a bit and found that the function user_switching_get_olduser_cookie is not returning any value to identify the last login user.
Please have a look at this issue as earliest as possible because our site is dependent on that and currently we are using it by deactivating jetpack.
