I saw this in our PHP error logs, thought it might be of interest:
[17-Mar-2015 17:40:50 Australia/Sydney] [2015-03-17 17:40:50] EXCEPTION: (Exception) Unable to find a place to insert object on column! at [<phabricator>/src/applications /maniphest/editor/ManiphestTransactionEditor.php:308] [17-Mar-2015 17:40:50 Australia/Sydney] arcanist(head=master, ref.master=b961869edac9), phabricator(head=master, ref.master=98899c822eb9), phlab(head=master, ref.master=d ddf486a2aec), phutil(head=master, ref.master=ce3959b4046f) [17-Mar-2015 17:40:50 Australia/Sydney] #0 ManiphestTransactionEditor::applyCustomExternalTransaction(ManiphestTask, ManiphestTransaction) called at [<phabricator>/src/ applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:494] [17-Mar-2015 17:40:50 Australia/Sydney] #1 PhabricatorApplicationTransactionEditor::applyExternalEffects(ManiphestTask, ManiphestTransaction) called at [<phabricator>/s rc/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:723] [17-Mar-2015 17:40:50 Australia/Sydney] #2 PhabricatorApplicationTransactionEditor::applyTransactions(ManiphestTask, array) called at [<phabricator>/src/applications/pr oject/controller/PhabricatorProjectMoveController.php:158] [17-Mar-2015 17:40:50 Australia/Sydney] #3 PhabricatorProjectMoveController::processRequest() called at [<phabricator>/src/aphront/AphrontController.php:33] [17-Mar-2015 17:40:50 Australia/Sydney] #4 AphrontController::handleRequest(AphrontRequest) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfigu ration.php:196] [17-Mar-2015 17:40:50 Australia/Sydney] #5 AphrontApplicationConfiguration::processRequest(AphrontRequest, PhutilDeferredLog, AphrontPHPHTTPSink) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:121] [17-Mar-2015 17:40:50 Australia/Sydney] #6 AphrontApplicationConfiguration::runHTTPRequest(AphrontPHPHTTPSink) called at [<phabricator>/webroot/index.php:19]