Host menu appears to greyout things like graphs, screens, triggers in inverse fashion.
For example, if host actually has screens they would appear in grey and not clickable.
If there are no screens - link will be available:
Please see screenshots of same hosts in 2.4.5 and 3.0a5:
P.S. Host menu in Latest 20 widged works fine
UPD: Look like Host group has the same problem: