I have not downloaded Yosemite yet as I was concerned that SCAL and inkscape would not work. Sorry to hear there are problems, but not surprised.
I lost export to scal with Mavericks and some extensions in inkscape, so since right now I do not NEED yoseminite...I stick to Mavericks.
Looking at an old Mac I have to use inkscape on, and hope eCal will work if I have to move on up.
I appreciate your post and hope as time passes you will continue to give input on how it is going.
LEARN, GROW, CREATE, SHARE
Mac 10.9.5 Yosemite, eCAL 1.506, ECAL2.023, SCAL4Pro, Export Plug-in, Inkscape 48, iPad/scal3