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Build 20080516 - create a sequence diagram - create a few lifeline elements on the diagram - click on Export Image button on the diagram toolbar - select JPG format - leave everything else as defaults and click on OK button - view the export image - see attached JPG sample - repeat the above steps for PNG format and see attached PNG sample
Created attachment 61508 [details] sequence diagram in jpg format
Created attachment 61509 [details] sequence diagram in png format
can't reproduce, always had right edges and see now. what is default settings in your exporting? did you try other diagrams/elements?
I used the default setting as indicated in the issue description. Now everthing is showing.
verified in build 20080805.