You probably have something like $wgGroupPermissions['*']['writeapi'] = false; in your "LocalSettings.php" file. You need to change this to $wgGroupPermissions['*']['writeapi'] = true;.
$wgGroupPermissions['*']['writeapi'] = false;
$wgGroupPermissions['*']['writeapi'] = true;
[[kgh]] (talk)
Finally got around to testing this, and yes, this fixes the problem. Thanks kgh!
Tina Tenbergen (talk)