Comment 1 for bug 1390318

Used git bisect to identify this commit as the source of the problem:

commit 847754aaacade1430aac99c40c6378b642cf3c1b
Author: Aaron Wells <email address hidden>
Date: Thu Oct 23 12:48:17 2014 +1300

    Add a <meta name="generator"> tag with the Mahara major version number

    Bug 1384497. This also adds a new $config->series to lib/version.php,
    which stores the major version (or as we sometimes call it, "the series")
    of the current release. It seemed better to store this separately rather
    than to try to parse it from $config->release, because we may change
    our release numbering strategy in the future.

    Change-Id: If4c0d7352e9433cdaf54a03bb922356d6c950e7d

The problem is also present in 1.10_STABLE from this commit being backported there. The problem is not present in 1.8_STABLE or 1.9_STABLE, however. Perhaps it was fixed by this commit (present in 1.8_STABLE & 1.9_STABLE but not 1.10_STABLE):

    Fixing a backporting mistake (Bug #1384497)

    Older versions handle the check_upgrades() output
    differently

    Change-Id: I7b847d814a504ea4a15f1c7b8a1a9e5d008299bf
    Signed-off-by: Robert Lyon <email address hidden>