Does it sound like this problem?
Bug 33604 – Server Status Error (see Comment - Charles Gillet 2009-01-28 10:26:49)
Quote:
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This bug caused an upgrade from 5.0.11 to 5.0.12 to abort on open source edition. I had to go in and kill all the swatch and zmlogger processes before I could get it to go through cleanly. You should post a note in your support portal home page to watch out for this or patch your 5.0.12 installer to check for and kill these leftover processes.
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