forgot to add... the 2 messages that we see in the log over an over again (as users try to add notes) are:
[2016/09/23 16:25:57 EDT] [EROR] /api/v3/teams/hxncopn41bnxtb9zux8e7uatoh/channels/68m5wa9sq7boxdb45hk1ksc13a/extra_info:SqlChannelStore.GetExtraMembers code=500 rid=az1xkrc8cbr9tbdq49r7gqjj7c uid=ss6u6kfbcigexk9qxe9q1qxtza ip=... We couldn't get the extra info for channel members [details: channel_id=68m5wa9sq7boxdb45hk1ksc13a, sql: Scan error on column index 1: unsupported Scan, storing driver.Value type into type *string]
[2016/09/23 16:26:18 EDT] [EROR] Failed to retrieve user profiles team_id=hxncopn41bnxtb9zux8e7uatoh, err=SqlUserStore.GetProfiles: store.sql_user.get_profiles.app_error, sql: Scan error on column index 10: unsupported Scan, storing driver.Value type into type *string