Installed Yosemite this AM. Attempted to print Dymo label this PM. Dymo software quit upon selecting print to use Dymo 400 Turbo Labelwriter. Downloaded latest Dymo driver from Dymo site - same result. Dymo operating perfectly prior to Yosemite installation. Once again, Apple using we customers to QC their software instead of doing their own complete testing. Fixed. See below on similar threads for link that provides fix for this problem.