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As part of the apps install process during an intall profile, there is a 'run' check that looks something like this:
'run' => (isset($_SESSION['apps']))?INSTALL_TASK_RUN_IF_NOT_COMPLETED:INSTALL_TASK_SKIP
As part of the cleanup process, we end up unsetting the $_SESSION['apps'] value which can cause stringed batch operations to fail. This patch just uncomments the unset() operation and provides a comment explaining what is going on.