Version: 1.5.5 (using KDE 3.5.5, Debian Package 4:3.5.5a.dfsg.1-8 (4.0)) Compiler: Target: i486-linux-gnu OS: Linux (i686) release 2.6.18-4-686 when adding actors to sequence diagram (drag them from use case), and saving, they aren't saved. sometimes even whole diagram gets lost from xmi file.
This is a known problem. Please update to 1.5.7-beta1, http://uml.sourceforge.net/download.php