Here's the long answer:

• If the Update Price/share box is checked, Navigator updates the “Price per Share” and “Valuation Date” fields on A&L screen for only that account and only when you have a partial sale transaction in that account or are purchasing additional shares in same account.
• Other security transactions like purchase of same security in a new account or sale of the entire lot do not update “Price per Share” and “Valuation Date” even if the Update Price/share box is checked.
• Even when Navigator updates those fields, the balance for that account is not, nor is a transaction created in Unrealized Gain/Loss. Some reports will notice that the price has changed and may recalculate the balance for the report.
• Even when Navigator updates those fields for that account, other accounts are not updated, even if the other accounts have the same symbol.