UPDATE - problem still exists even after:
1 - disabling the Hindu language
2 - deleting the solr index
3 - clearing cache and running cron many times
4 - verifying that the lang_hi does not exist in the db table
5 - "optimizing" the INNOdb table in phpmyadmin

In fact I cannot add an organic group at all - no matter which languga I choose - and this is the only error I receive

PDOException: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'lang_hi' in 'field list': INSERT INTO {translation_overview_priority} (tnid, lang_ar, lang_hy, lang_bn, lang_zhhans, lang_en, lang_fr, lang_de, lang_hi, lang_id, lang_it, lang_ja, lang_ko, lang_ptbr, lang_ru, lang_es, lang_tl, lang_tr, lang_ur) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9, :db_insert_placeholder_10, :db_insert_placeholder_11, :db_insert_placeholder_12, :db_insert_placeholder_13, :db_insert_placeholder_14, :db_insert_placeholder_15, :db_insert_placeholder_16, :db_insert_placeholder_17, :db_insert_placeholder_18); Array ( [:db_insert_placeholder_0] => 19 [:db_insert_placeholder_1] => 1 [:db_insert_placeholder_2] => 1 [:db_insert_placeholder_3] => 1 [:db_insert_placeholder_4] => 1 [:db_insert_placeholder_5] => 1 [:db_insert_placeholder_6] => 1 [:db_insert_placeholder_7] => 1 [:db_insert_placeholder_8] => 1 [:db_insert_placeholder_9] => 1 [:db_insert_placeholder_10] => 1 [:db_insert_placeholder_11] => 1 [:db_insert_placeholder_12] => 1 [:db_insert_placeholder_13] => 1 [:db_insert_placeholder_14] => 1 [:db_insert_placeholder_15] => 1 [:db_insert_placeholder_16] => 1 [:db_insert_placeholder_17] => 1 [:db_insert_placeholder_18] => 1 ) in drupal_write_record() (line 6888 of /var/aegir/platforms/Drupal7-10SocialGroup1/includes/common.inc).

UPDATE - disabling the Hindu language does not help - same error even after clearing the cache twice.

When trying to add an organic group in D7, error thrown whether or not I choose English as language or Language Neutral.

PDOException: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'lang_hi' in 'field list': INSERT INTO {translation_overview_priority} (tnid, lang_ar, lang_hy, lang_bn, lang_zhhans, lang_en, lang_fr, lang_de, lang_hi, lang_id, lang_it, lang_ja, lang_ko, lang_ptbr, lang_ru, lang_es, lang_tl, lang_tr, lang_ur) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9, :db_insert_placeholder_10, :db_insert_placeholder_11, :db_insert_placeholder_12, :db_insert_placeholder_13, :db_insert_placeholder_14, :db_insert_placeholder_15, :db_insert_placeholder_16, :db_insert_placeholder_17, :db_insert_placeholder_18); Array ( [:db_insert_placeholder_0] => 5 [:db_insert_placeholder_1] => 1 [:db_insert_placeholder_2] => 1 [:db_insert_placeholder_3] => 1 [:db_insert_placeholder_4] => 1 [:db_insert_placeholder_5] => 1 [:db_insert_placeholder_6] => 1 [:db_insert_placeholder_7] => 1 [:db_insert_placeholder_8] => 1 [:db_insert_placeholder_9] => 1 [:db_insert_placeholder_10] => 1 [:db_insert_placeholder_11] => 1 [:db_insert_placeholder_12] => 1 [:db_insert_placeholder_13] => 1 [:db_insert_placeholder_14] => 1 [:db_insert_placeholder_15] => 1 [:db_insert_placeholder_16] => 1 [:db_insert_placeholder_17] => 1 [:db_insert_placeholder_18] => 1 ) in drupal_write_record() (line 6888 of /var/aegir/platforms/Drupal7-10SocialGroup1/includes/common.inc).
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