If a page has no interlanguage links then "Add links" is missing in MonoBook but present in Vector, Cologne Blue and Modern.
Current example:
https://en.wikipedia.org/wiki/Pineau_de_Re?useskin=monobook
If there are interlanguage links then "Edit links" is correctly present in MonoBook. Example:
https://en.wikipedia.org/wiki/Example?useskin=monobook
First reported at
https://en.wikipedia.org/wiki/Wikipedia:Village_pump_%28technical%29#.22Edit_links.22_doesn.27t_appear_anymore_.28with_Monobook.29
Considering the timing, this may be caused by 1.24wmf2.
The above was tested in Firefox, Opera, Safari.
In IE9 I'm missing "Add links" in all skins, but have "Edit links" in all skins.
Version: unspecified
Severity: major