How did you updated? just replaced files? try deactivate and again re-activate to trigger activation hook. Notification and subscription system has re-coded in 2.4 and if you are overriding notifications then make sure to match it with new notifications theme file.

Yes this has been solved, please download master zip from github.

Please update anspress and email from Github.

Try this AnsPress: https://github.com/anspress/anspress/archive/master.zip

Bug confirmed, will be solved.

I tried adding all permissions to my custom role.. However, the option of Selecting the best answer is not showing up.

Its your theme issue.

Follow this: https://anspress.io/questions/question/bug-following-does-not-work/ Update you pot file using ap.po

Its because you have not updated plugin as per general procedure, instead you you just replaced the file. For fixing this just deactivate and re-activate AnsPress and our activation hook will trigger and add required tables (which got added in 2.4).

You can override AnsPress theme from a child theme and parent theme. By default AnsPress looks inside child theme for override and then parent theme. This is useful when you are using child theme.