Hi,
I was having tons of problems after upgrading to 10.3.3/4, Printer Setup crashes, Lablelwriter 330 Turbo not recognized etc.etc.
Then I found this page :
http://dymo.custhelp.com/cgi-bin/dymo.cfg/php/enduser/std_adp.php?p_faqid=9
It tells you how to upgrade the firmware, mine was version 0D, the latest seems to be 0K (as in zero-K), pun intended maybe by Dymo, because after upgrading everything was really OK.
The instructions do not seem to make much sense, the upgrade in the Trinity folder, etc.etc. AND you'll need a PC to do the upgrade.

But now it works like a peach.

Michele