My main job is working on a scrivener document that is saved on DropBox. My office computer is only allowed to run Mavericks for the time being, while I am thinking of updating my personal laptop to Yosemite. Can I still edit the same Scrivener file on DropBox with two different versions of OS X? Could you envision problems?
Simply saying this is a bad idea will convince me not to do it, but if this is relatively safe I will go for it.
Unlikely. Mavericks is not nearly old enough for Apple itself to be dropping support for it, and that’s the only reason why we would consider doing so.