This is the official answer of the support for the moment:
Our current version of FTB 7 for Mac is not compatible with the latest release of Mac OSX, which was released in the last days of September.
For supported versions of Mac OSX with FTB 7, see the following link: http://www.myheritage.com/help-center#/path/951697771
The MyHeritage Team is aware of it and has some adjustment work for this in the planning.
However, currently, there is no time frame known on when this will be available.
If You want more specific tech infos, send an email to the support at firstname.lastname@example.org