Incorrect range-checking of dates in Memberships > Batch Data Entry

The 'Member Since' date, and possibly the others, are validated against the old default of '20 years before now' instead of the date range(s) configured in Administer > Localisation > Date Formats > Advanced settings. Thus any date earlier than 1995, including those read from the existing membership record, currently fails validation at the import stage and causes the whole batch of renewals to be blocked. Fixing this is important for long-standing membership organisations migrating to CiviCRM.
See also http://forum.civicrm.org/index.php/topic,31713