Reddit generally is slightly evil with the U.I., but the previous release with extensions allowed Cmd-click to work on it. Installing today's release broke that. Disabling Reddit Enhancer and StopTheMadness Pro didn't make any difference.
Cmd+Click should always do the same thing as Context Menu - Open Link in New Tab. Sites shouldn't be able to override that except by explicit permission.
1.0.1 (140-rc), WebKit 624.1.2.19.2
Tahoe (26)