I've been using "wp-security-scan" for a long time and it's been working very well.
My plugin's version was 3.1.0.
So, today there was an update to version 4.0.1.
I've done the update and with this new version activated I can't see it in menu anymore (it's disappeared from there).
I have no access to settings, scan, monitoring view or anything else.
The plugin "wp-security-scan" apppears activated in the plugins list but doesn't have 'settings' link, only 'deactivate' link.