Thanks to our friends at lambslist.com a subtle bug in Mac version of DYMO Label software has been discovered (and fixed). The problem manifests itself at print time, when the label data is printed using the default font instead of one specified in the label file. The fix for DYMO Label software is scheduled for the next release, 8.4. In the meantime the js script library has been updated to include a workaround for the problem.
The js script file is available from http://labelwriter.com/software/dls/sdk/js/DYMO.Label.Framework.1.2.2.js.
The http://labelwriter.com/software/dls/sdk/js/DYMO.Label.Framework.latest.js has been updated to version 1.2.2 as well.