Maybe this issue is solved.. but it is still a pain in the but.
Each and every site I have updated from 4.2.6 to 4.2.9 has lost its settings and needed to be reconfigured.
Which is especially troublesome since the pages where “disable sociable” has been clicked have to be visited again one by one and the option has to be enabled.
All in all updating this plugin takes more time to update then doing a version update of WordPress …
Also the weird “invisible link” is still there as seen on the picture posted by @dimitry Lund https://i47.tinypic.com/awlqq.jpg