During the project invitation for two projects, the "Add Project" dialog pre-selected the option "Use exisiting project" while no adequate project existed in the workspace. The dialog itself prompted "No projects exists with this name to update from", implying that Saros already knows which projects are suitable for updating. The appropriate pre-selection would have been "Create new project".
This happened to Julia around 14:57 (see logfiles here: http://saros-build.imp.fu-berlin.de/uat/2012_09_27/logs/\). A screenshot is attached to this entry.