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[Launchpad Bug Tracker <742122@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:~trb143/openlp/general

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https://bugs.launchpad.net/bugs/742122

Title:
  Prevent multiple instances

Status in OpenLP - Worship Presentation Software:
  Fix Committed

Bug description:
  If multiple instances of OpenLP are running at the same time, then it
  can cause confusion, issues with the Remote plugin, I think there has
  also been an instance of sqlite database locking. Probably not
  desirable.

  Suggestion to investigate whether we can detect another instance and
  exit gracefully if there is. However note that a downside is that if
  the OpenLP UI has crashed but the process is still running, this can
  cause problems for the user...

  Examples: http://www.mail-
  archive.com/pyqt@xxxxxxxxxxxxxxxxxxxxxx/msg20005.html