The Market Value of your investments may be correct, but the number shown in the Account Bar also includes your account's Cash Balance.
Which brings up the question:In the Portfolio View, are you including the Cash Balance in that view?Check this: Click the Customize button. In the popup select the Securities tab.Make sure that all securities have a checkmark, including one named "No Security (includes cash)".
I have Vanguard too. When mine converted if the price/share stayed the same I just changed the name and ticker. Here is what I found........To switch to Vanguard Admiral (I have several) you should use Corporate Acquisition (or the new Mutual Fund Conversion) and you have to manually calculate how many new shares you got for each ONE old share. Took me 3 times to notice that part. So you may have to do some dividing on paper first. Don't worry if the price per share comes out fractionally different. Just be sure the # of shares and cost is accurate. Most of my conversions to Admiral were for all the same # of shares. So I just changed the name and symbol. One fund was so close I just did an adjustment and removed .176 shares. I had 536.743 shares before and they converted in only 536.567 shares.
In Account Overview, I saw that the price per share had somehow changed to a different amount. When I changed it to yesterday's price, all returned to normal.