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Autchcache owns any mid submission forms when cron is run due to it's form cache (form_cache) getting completely cleared with a cache_clear_all(null,'cache_form') (system.module's _cron job calls) since there's no expiration check unlike core cache_clear_all, which ignores cache_form entries with valid expiration times.
I'm not familiar enough with authcache for any suggestions around this, but it's very problematic. When CCK goes to get it's multiple fields... long story short, it's making the field completely disappear: (issue in cck issue queue about it http://drupal.org/node/406050 )