Hot fix release for v3.0:

• Fix for incomplete initialization of map markers, resulting in no visible markers
• Fix for occasional server shutdown stall due to non-daemon thread

Note: this build was a hotfix, so the version internally will display as '3.0-SNAPSHOT-338' - this is fine: it's just that I didn't run a clean build when I went from the tested hotfix to the 'tagged for release' build.